Write down the solution for this math problem: Solve 0 = 9*b - 4*b + 20 for b.
answer: -4

Write down the solution for this math problem: Solve 20*w + 231 = -w for w.
answer: -11

Write down the solution for this math problem: Solve 11*l = -32 + 10 for l.
answer: -2

Write down the solution for this math problem: Solve 4272*o - 317880 = -6324*o for o.
answer:
30