Write down the solution for this math problem: Solve -6*z + 3*z = -9 for z.
answer: 3

Write down the solution for this math problem: Solve s - 50 = -s - 60 for s.
answer: -5

Write down the solution for this math problem: Solve 4992*r - 4594*r - 1194 = 0 for r.
answer: 3

Write down the solution for this math problem: Solve 1911*f + 1517*f - 207*f - 242*f = -145971 for f.
answer:
-49