Write down the solution for this math problem: Solve 0 = -28*f + 87*f + 531 for f.
answer: -9

Write down the solution for this math problem: Solve 20 = -33*f + 53 for f.
answer: 1

Write down the solution for this math problem: Solve -15*k + 264 = 29*k for k.
answer: 6

Write down the solution for this math problem: Solve -772*f - 41103 - 40659 = -10738 for f.
answer:
-92