Question:
Solve -15*s + 108*s - 36 = 57 for s..

Answer:
1

Question:
Solve 458*s - 3109 = 555 for s..

Answer:
8

Question:
Solve -5 = 12*z - 11*z for z..

Answer:
-5

Question:
Solve 1811*u - 3607*u - 966 - 204 = -1835*u for u..

Answer:
30