Write down the solution for this math problem: Solve 5*u - 6 = 3*u for u.
answer: 3

Write down the solution for this math problem: Solve -13*w - 2*w + 1158 = 178*w for w.
answer: 6

Write down the solution for this math problem: Solve 81 = -140*x - 199 for x.
answer: -2

Write down the solution for this math problem: Solve 0 = -9*w + 158 - 176 for w.
answer:
-2