Question:
Solve -587 + 128 = -9*i - 42*i for i..

Answer:
9

Question:
Solve 153*r - 6681 = 546*r for r..

Answer:
-17

Question:
Solve -34 + 31 = -z for z..

Answer:
3

Question:
Solve -35*m + 61 - 96 = 0 for m..

Answer:
-1