Write down the solution for this math problem: Solve -28*f + 307*f - 82760 = -338*f - 88313 for f.
answer: -9

Write down the solution for this math problem: Solve 12*z - 40*z - 960 = 20*z for z.
answer: -20

Write down the solution for this math problem: Solve 0 = 30*h - 20*h + 30 for h.
answer: -3

Write down the solution for this math problem: Solve 51*i - 62*i = 88 for i.
answer:
-8