Answer: x = (-12)
2x+29 + 9 = x+26
1. Make x to right side, and numbers to the left, without forgetting to change the sign:
2x - x = 26-29-9
x = -12
Proof:
9 + 2 * (-12) + 29 = (-12) + 26
9 + (-24) + 29 = 14
9 - 24 + 29 = 14
-15 + 29 = 14
14 = 14 (If values are the same, the comparison is right), and it mean the equation is solved right.