Question:
Solve -68*u = -16*u - 12*u - 16*u + 1272 for u..

Answer:
-53

Question:
Solve 255*b = -153 - 667 + 55 for b..

Answer:
-3

Question:
Solve 0 = 38770*b - 38866*b - 2784 for b..

Answer:
-29

Question:
Solve 9*b + 31*b = 120 for b..

Answer:
3