Write down the solution for this math problem: Solve 185*x = 212*x - 81 for x.
answer: 3

Write down the solution for this math problem: Solve 288*i = 285*i - 9 for i.
answer: -3

Write down the solution for this math problem: Solve -510*f - 12817 = 201*f - 158*f + 13727 for f.
answer: -48

Write down the solution for this math problem: Solve 4*b + 0*b + 56 + 54 = 9*b for b.
answer:
22