Write down the solution for this math problem: Solve -72*u - 870 = 2082 for u.
answer: -41

Write down the solution for this math problem: Solve f - 151 = -156 for f.
answer: -5

Write down the solution for this math problem: Solve -91*w + 104*w = -91 for w.
answer: -7

Write down the solution for this math problem: Solve 0 = 18*u + 54 - 0 for u.
answer:
-3