Question:
Solve 59 = -7*w + 87 for w..

Answer:
4

Question:
Solve 400*z + 14267 = -14533 for z..

Answer:
-72

Question:
Solve 0 = 243553*b - 243098*b - 3185 for b..

Answer:
7

Question:
Solve 0 = 2*x + 8*x + 30 for x..

Answer:
-3