Write down the solution for this math problem: Solve -13*i + 7*i = 30 for i.
answer: -5

Write down the solution for this math problem: Solve -858 = 25258*s - 25297*s for s.
answer: 22

Write down the solution for this math problem: Solve 0 = 136*x + 847 + 241 for x.
answer: -8

Write down the solution for this math problem: Solve -125*f - 4678 = 2042 - 345 for f.
answer:
-51