Write down the solution for this math problem: Solve 4143*u = -5040*u - 183660 for u.
answer: -20

Write down the solution for this math problem: Solve 476*n - 921*n + 390*n + 1980 = 0 for n.
answer: 36

Write down the solution for this math problem: Solve 3*z = 5805 - 5838 for z.
answer: -11

Write down the solution for this math problem: Solve 9 + 3 = 4*i for i.
answer:
3