Write down the solution for this math problem: Solve -33*f + 138913 - 139177 = 0 for f.
answer: -8

Write down the solution for this math problem: Solve -650*k + 85053 - 9430 = 725*k + 234*k for k.
answer: 47

Write down the solution for this math problem: Solve -30*k - 7*k = 185 for k.
answer: -5

Write down the solution for this math problem: Solve 0 = -7*d + 4*d - 15 for d.
answer:
-5