Question:
Solve -25*b + 6 = -28*b for b..

Answer:
-2

Question:
Solve 0 = -74*u + 3486 - 4004 for u..

Answer:
-7

Question:
Solve 10 = 9*l + 46 for l..

Answer:
-4

Question:
Solve -9268 = -21*a - 8995 for a..

Answer:
13