Question:
Solve 0 = 30*b - 31*b + 2 for b..

Answer:
2

Question:
Solve -40 = 107*m + 174 for m..

Answer:
-2

Question:
Solve 197*l - 1704 = 107*l - 1863 + 4839 for l..

Answer:
52

Question:
Solve 14 + 34 = -468*f + 476*f for f..

Answer:
6