Question:
Solve 522*b = 2109 + 1545 for b..

Answer:
7

Question:
Solve -783*n = -204*n + 8685 for n..

Answer:
-15

Question:
Solve 12*z = 46 - 82 for z..

Answer:
-3

Question:
Solve 257 - 728 = -157*r for r..

Answer:
3