Question:
Solve -40 = -150*i + 1910 for i..

Answer:
13

Question:
Solve -10*z - 330*z + 5100 = 0 for z..

Answer:
15

Question:
Solve 22*t = -61 + 193 for t..

Answer:
6

Question:
Solve 108*s = -23*s - 1572 for s..

Answer:
-12