Question:
Solve 8*z = 31*z + 23 for z..

Answer:
-1

Question:
Solve 2349 = -7*o + 2398 for o..

Answer:
7

Question:
Solve -w = 9*w - 40 for w..

Answer:
4

Question:
Solve -57*z = -196*z - 417 for z..

Answer:
-3