Write down the solution for this math problem: Solve -11*f - f - 12 = 0 for f.
answer: -1

Write down the solution for this math problem: Solve 0 = 25*c + 231 - 356 for c.
answer: 5

Write down the solution for this math problem: Solve -313*k + 158796 - 184462 = 0 for k.
answer: -82

Write down the solution for this math problem: Solve 498*w - 304*w = 304*w + 1430 for w.
answer:
-13