Write down the solution for this math problem: Solve 20 = -2*f + 7*f for f.
answer: 4

Write down the solution for this math problem: Solve -212*h - 1018*h - 1647*h = 337169 - 12068 for h.
answer: -113

Write down the solution for this math problem: Solve -3*u = 23*u + 8*u for u.
answer: 0

Write down the solution for this math problem: Solve 52*i + 18*i - 30*i = 120 for i.
answer:
3