Write down the solution for this math problem: Solve 14672*l + 80 = 14682*l for l.
answer: 8

Write down the solution for this math problem: Solve 0 = 261*p - 207*p - 432 for p.
answer: 8

Write down the solution for this math problem: Solve 9*f - 24*f - 15 = 0 for f.
answer: -1

Write down the solution for this math problem: Solve 3*b = 42*b + 19 + 20 for b.
answer:
-1