Write down the solution for this math problem: Solve u + 43*u = 517 + 143 for u.
answer: 15

Write down the solution for this math problem: Solve -30 = -0*n - 6*n for n.
answer: 5

Write down the solution for this math problem: Solve 175*r + 292*r - 70*r - 9225 = 28*r for r.
answer: 25

Write down the solution for this math problem: Solve 204*u - 879 + 2452 - 837 - 1756 = 0 for u.
answer:
5