Write down the solution for this math problem: Solve -20 + 120 = 19*f + f for f.
answer: 5

Write down the solution for this math problem: Solve 33*b - 641 = -641 for b.
answer: 0

Write down the solution for this math problem: Solve 215*u - 20 = 205*u for u.
answer: 2

Write down the solution for this math problem: Solve 42*p - 303 = -26*p - 33*p for p.
answer:
3