Write down the solution for this math problem: Solve 25*u - 8385 - 22395 = -1685*u for u.
answer: 18

Write down the solution for this math problem: Solve -11*i = -9*i - 11*i for i.
answer: 0

Write down the solution for this math problem: Solve -9*v = 15*v + 120 for v.
answer: -5

Write down the solution for this math problem: Solve -286 + 314 = -7*z for z.
answer:
-4