Question:
Solve -151*z = 1960 + 456 for z..

Answer:
-16

Question:
Solve 10*u + 84 + 46 = 0 for u..

Answer:
-13

Question:
Solve -21*q = 13*q - 170 for q..

Answer:
5

Question:
Solve a - 12*a = 0 for a..

Answer:
0