Question:
Solve -5 = -6*f + 7 for f..

Answer:
2

Question:
Solve -30 - 253 = 54*b + 203 for b..

Answer:
-9

Question:
Solve -743*o = 133*o + 42048 for o..

Answer:
-48

Question:
Solve -1210*i - 12570 = 1304*i for i..

Answer:
-5