To solve this equation, we need to simplify each side step by step.

1) (0.85x - 1.72) / 1.3 = 2.617 - 8 15/31 + x + 3 29/31

2) (0.85x - 1.72) / 1.3 = -5.483 + x + 3.935

3) (0.65x - 1.32) = -1.548 + x

4) 0.65x - 1.32 = -1.548 + x

5) 0.65x - 1.32 = -1.548 + x

6) 1.65x - 1.32 = -1.548

7) 1.65x = -1.548 + 1.32

8) 1.65x = -0.228

9) x = -0.228 / 1.65

10) x = -0.138

Therefore, the solution to the equation is x = -0.138.