Question:
Solve -z - 130 + 139 = 0 for z..

Answer:
9

Question:
Solve -40 = 142*t - 152*t for t..

Answer:
4

Question:
Solve -305 = 31*w - 26 for w..

Answer:
-9

Question:
Solve 47 = -4*d + 81 - 58 for d..

Answer:
-6