Determine all triples $(a,b,c)$ of real numbers such that 
$$ (2a+1)^2 - 4b = (2b+1)^2 - 4c = (2c+1)^2 - 4a = 5. $$
To determine all triples \((a, b, c)\) of real numbers such that 
\[
(2a+1)^2 - 4b = (2b+1)^2 - 4c = (2c+1)^2 - 4a = 5,
\]
we start by setting each expression equal to a constant \(k\). Thus, we have:
\[
(2a+1)^2 - 4b = k,
\]
\[
(2b+1)^2 - 4c = k,
\]
\[
(2c+1)^2 - 4a = k.
\]
Given that \(k = 5\), we can rewrite the equations as:
\[
(2a+1)^2 - 4b = 5,
\]
\[
(2b+1)^2 - 4c = 5,
\]
\[
(2c+1)^2 - 4a = 5.
\]

1. **Solve for \(b\) in terms of \(a\):**
   \[
   (2a+1)^2 - 4b = 5 \implies 4a^2 + 4a + 1 - 4b = 5 \implies 4a^2 + 4a - 4b = 4 \implies b = a^2 + a - 1.
   \]

2. **Solve for \(c\) in terms of \(b\):**
   \[
   (2b+1)^2 - 4c = 5 \implies 4b^2 + 4b + 1 - 4c = 5 \implies 4b^2 + 4b - 4c = 4 \implies c = b^2 + b - 1.
   \]
   Substitute \(b = a^2 + a - 1\) into the expression for \(c\):
   \[
   c = (a^2 + a - 1)^2 + (a^2 + a - 1) - 1.
   \]
   Simplify:
   \[
   c = a^4 + 2a^3 + a^2 - 2a^2 - 2a + 1 + a^2 + a - 1 - 1 \implies c = a^4 + 2a^3 - a - 1.
   \]

3. **Substitute \(c\) into the third equation:**
   \[
   (2c+1)^2 - 4a = 5 \implies (2(a^4 + 2a^3 - a - 1) + 1)^2 - 4a = 5.
   \]
   Simplify:
   \[
   (2a^4 + 4a^3 - 2a - 2 + 1)^2 - 4a = 5 \implies (2a^4 + 4a^3 - 2a - 1)^2 - 4a = 5.
   \]

4. **Simplify the equation:**
   \[
   (2a^4 + 4a^3 - 2a - 1)^2 - 4a = 5.
   \]
   This is a complex polynomial equation. To solve it, we factorize:
   \[
   a^8 + 4a^7 + 4a^6 - 2a^5 - 5a^4 - 2a^3 + a^2 - 1 = 0.
   \]
   Using Horner's method, we factorize:
   \[
   (a - 1)(a + 1)(a^6 + 4a^5 + 5a^4 + 2a^3 + 1) = 0.
   \]

5. **Solve for \(a\):**
   \[
   a = 1 \implies b = 1^2 + 1 - 1 = 1 \implies c = 1^2 + 1 - 1 = 1.
   \]
   \[
   a = -1 \implies b = (-1)^2 - 1 - 1 = -1 \implies c = (-1)^2 - 1 - 1 = -1.
   \]

6. **Verify the remaining factor:**
   \[
   a^6 + 4a^5 + 5a^4 + 2a^3 + 1 > 0 \text{ for all } a \neq 1, -1.
   \]
   This can be shown by analyzing the polynomial for different ranges of \(a\).

Thus, the only solutions are:
\[
(a, b, c) = (1, 1, 1) \text{ and } (a, b, c) = (-1, -1, -1).
\]

The final answer is \( \boxed{ (1, 1, 1) } \) and \((-1, -1, -1)\).