Write down the solution for this math problem: Solve 0 = -422*f + 3315 + 4928 + 1041 for f.
answer: 22

Write down the solution for this math problem: Solve 8*a - 3*a - 20 = 0 for a.
answer: 4

Write down the solution for this math problem: Solve -24*w + 211 = -111*w - 485 for w.
answer: -8

Write down the solution for this math problem: Solve 5460 = -46*l + 11836 - 5410 for l.
answer:
21