Let $x_1 \dots, x_{42}$, be real numbers such that $5x_{i+1}-x_i-3x_ix_{i+1}=1$ for each $1 \le i \le 42$, with $x_1=x_{43}$. Find all the product of all possible values for $x_1 + x_2 + \dots + x_{42}$.

[i] Proposed by Michael Ma [/i]
1. Given the recurrence relation \(5x_{i+1} - x_i - 3x_i x_{i+1} = 1\), we can solve for \(x_{i+1}\) in terms of \(x_i\):
   \[
   5x_{i+1} - x_i - 3x_i x_{i+1} = 1 \implies 5x_{i+1} - 3x_i x_{i+1} = x_i + 1 \implies x_{i+1}(5 - 3x_i) = x_i + 1 \implies x_{i+1} = \frac{x_i + 1}{5 - 3x_i}
   \]

2. To find a general form for \(x_{n+1}\), we use the transformation:
   \[
   x_{n+1} = \frac{a_n x_1 + b_n}{c_n x_1 + d_n}
   \]
   where \(a_1 = 1\), \(b_1 = 1\), \(c_1 = -3\), and \(d_1 = 5\).

3. The recurrence relations for \(a_n\), \(b_n\), \(c_n\), and \(d_n\) are:
   \[
   a_{n+1} = a_n + c_n, \quad b_{n+1} = b_n + d_n, \quad c_{n+1} = 5c_n - 3a_n, \quad d_{n+1} = 5d_n - 3b_n
   \]

4. Solving these recurrence relations, we find:
   \[
   a_n = -2^{2n-1} + 3 \cdot 2^{n-1}, \quad b_n = 2^{2n-1} - 2^{n-1}, \quad c_n = 3 \cdot 2^{n-1} - 3 \cdot 2^{2n-1}, \quad d_n = 3 \cdot 2^{2n-1} - 2^{n-1}
   \]

5. Given \(x_1 = x_{43}\), we have:
   \[
   x_1 = \frac{a_{42} x_1 + b_{42}}{c_{42} x_1 + d_{42}}
   \]
   This is a quadratic equation in \(x_1\).

6. Substituting the expressions for \(a_{42}\), \(b_{42}\), \(c_{42}\), and \(d_{42}\), we get:
   \[
   x_1 = \frac{(-2^{83} + 3 \cdot 2^{41}) x_1 + (2^{83} - 2^{41})}{(3 \cdot 2^{41} - 3 \cdot 2^{83}) x_1 + (3 \cdot 2^{83} - 2^{41})}
   \]

7. Simplifying, we obtain a quadratic equation:
   \[
   (3 \cdot 2^{41} - 3 \cdot 2^{83}) x_1^2 + (2^{85} - 2^{43}) x_1 + \text{constant} = 0
   \]

8. Using Vieta's formulas, the sum of the roots of the quadratic equation is:
   \[
   \frac{2^{85} - 2^{43}}{3(2^{83} - 2^{41})} = \frac{4}{3}
   \]

9. Given that \(x_1 = 1\) is a solution, the other solution must be \(\frac{1}{3}\).

10. If \(x_1 = 1\), then \(x_i = 1\) for all \(i\), and the sum \(x_1 + x_2 + \dots + x_{42} = 42\).

11. If \(x_1 = \frac{1}{3}\), then \(x_i = \frac{1}{3}\) for all \(i\), and the sum \(x_1 + x_2 + \dots + x_{42} = 14\).

12. The product of all possible values for \(x_1 + x_2 + \dots + x_{42}\) is:
   \[
   42 \cdot 14 = 588
   \]

The final answer is \(\boxed{588}\).