Find all pairs $(x,y)$ of real numbers that satisfy,
\begin{align*}
    x^2+y^2+x+y &= xy(x+y)-\frac{10}{27}\\
    |xy| & \leq \frac{25}{9}.
\end{align*}

To find all pairs \((x, y)\) of real numbers that satisfy the given equations:
\[
x^2 + y^2 + x + y = xy(x + y) - \frac{10}{27}
\]
\[
|xy| \leq \frac{25}{9}
\]

1. **Initial Observations and Assumptions**:
   - Note that \((xy - 1)(x + y) > 0\). This implies that if \(xy > 1\), then \(x + y > 0\), and if \(xy < 1\), then \(x + y < 0\).

2. **Case 1: \(xy > 1\)**:
   - Assume \(xy > 1\). Then \(x + y > 0\).
   - Given the constraint \(|xy| \leq \frac{25}{9}\), we have \(xy \leq \frac{25}{9}\).
   - Substitute \(xy \leq \frac{25}{9}\) into the original equation:
     \[
     x^2 + y^2 + x + y \leq \frac{25}{9}(x + y) - \frac{10}{27}
     \]
   - Rearrange the inequality:
     \[
     27(x^2 + y^2) + 10 \leq 48(x + y)
     \]
   - By the Cauchy-Schwarz inequality, \(x^2 + y^2 \geq \frac{(x + y)^2}{2}\):
     \[
     27 \left(\frac{(x + y)^2}{2}\right) + 10 \leq 48(x + y)
     \]
     \[
     96(x + y) \geq 27(x + y)^2 + 20
     \]
     \[
     27(x + y)^2 - 96(x + y) + 20 \leq 0
     \]
   - Let \(t = x + y\):
     \[
     27t^2 - 96t + 20 \leq 0
     \]
   - Solve the quadratic inequality:
     \[
     t = \frac{96 \pm \sqrt{96^2 - 4 \cdot 27 \cdot 20}}{2 \cdot 27}
     \]
     \[
     t = \frac{96 \pm \sqrt{9216 - 2160}}{54}
     \]
     \[
     t = \frac{96 \pm \sqrt{7056}}{54}
     \]
     \[
     t = \frac{96 \pm 84}{54}
     \]
     \[
     t = \frac{180}{54} \quad \text{or} \quad t = \frac{12}{54}
     \]
     \[
     t = \frac{10}{3} \quad \text{or} \quad t = \frac{2}{9}
     \]
   - Therefore, \(\frac{2}{9} \leq x + y \leq \frac{10}{3}\).

3. **Lower Bound Analysis**:
   - Using \(x^2 + y^2 + x + y \geq 2xy + 2\sqrt{xy}\):
     \[
     x + y \geq 2 + \frac{10}{27xy} + \frac{2}{\sqrt{xy}}
     \]
   - Given \(xy \leq \frac{25}{9}\):
     \[
     x + y \geq 2 + \frac{10}{27 \cdot \frac{25}{9}} + \frac{2}{\frac{5}{3}}
     \]
     \[
     x + y \geq 2 + \frac{10}{75} + \frac{6}{5}
     \]
     \[
     x + y \geq 2 + \frac{2}{15} + \frac{6}{5}
     \]
     \[
     x + y \geq 2 + \frac{2}{15} + \frac{18}{15}
     \]
     \[
     x + y \geq 2 + \frac{20}{15}
     \]
     \[
     x + y \geq 2 + \frac{4}{3}
     \]
     \[
     x + y \geq \frac{10}{3}
     \]
   - Therefore, \(x + y = \frac{10}{3}\) and \(xy = \frac{25}{9}\).

4. **Verification**:
   - Plugging \(x + y = \frac{10}{3}\) and \(xy = \frac{25}{9}\) into the original equation:
     \[
     x^2 + y^2 + x + y = xy(x + y) - \frac{10}{27}
     \]
     \[
     x^2 + y^2 + \frac{10}{3} = \frac{25}{9} \cdot \frac{10}{3} - \frac{10}{27}
     \]
     \[
     x^2 + y^2 + \frac{10}{3} = \frac{250}{27} - \frac{10}{27}
     \]
     \[
     x^2 + y^2 + \frac{10}{3} = \frac{240}{27}
     \]
     \[
     x^2 + y^2 + \frac{10}{3} = \frac{80}{9}
     \]
     \[
     x^2 + y^2 = \frac{80}{9} - \frac{30}{9}
     \]
     \[
     x^2 + y^2 = \frac{50}{9}
     \]
     \[
     2(x^2 + y^2) = \frac{100}{9}
     \]
     \[
     (x + y)^2 = \frac{100}{9}
     \]
     \[
     (x - y)^2 = 0
     \]
   - Therefore, \(x = y = \frac{5}{3}\).

5. **Case 2: \(xy < 1\)**:
   - Assume \(xy < 1\). Then \(x + y < 0\).
   - Let \(x = -a\) and \(y = -b\) where \(a, b > 0\):
     \[
     a^2 + b^2 + ab(a + b) = a + b - \frac{10}{27}
     \]
   - Let \(t = a + b\):
     \[
     a^2 + b^2 \geq \frac{t^2}{2}
     \]
     \[
     t \geq \frac{t^2}{2} + \frac{10}{27} + abt
     \]
     \[
     0 \geq \frac{t^2}{2} + (ab - 1)t + \frac{10}{27}
     \]
   - Using AM-GM, \(t \geq 2\sqrt{ab}\):
     \[
     (3q - 1)^2(3q + 5) \leq 0
     \]
   - Therefore, \(q = \frac{1}{3}\), \(ab = \frac{1}{9}\), and \(a = b\):
     \[
     (x, y) = \left(-\frac{1}{3}, -\frac{1}{3}\right)
     \]

6. **Case 3: One positive, one negative**:
   - Let \(x = a\) and \(y = -b\):
     \[
     a^2 + b^2 + a - b = -ab(a - b) - \frac{10}{27}
     \]
     \[
     a^2 + b^2 + ab(a - b) + (a - b) = -\frac{10}{27}
     \]
   - Let \(t = b - a\):
     \[
     t^2 \leq t + (t - 2)ab - \frac{10}{27}
     \]
   - Using \(ab \leq \frac{25}{9}\):
     \[
     t^2 \leq t - \frac{10}{27}
     \]
   - This has no solutions.

Therefore, the only solutions to the given equation are:
\[
\boxed{(x, y) = \left(\frac{5}{3}, \frac{5}{3}\right), \left(-\frac{1}{3}, -\frac{1}{3}\right)}
\]