Write down the solution for this math problem: Solve 57 = -11*k - 20 for k.
answer: -7

Write down the solution for this math problem: Solve 966*r + 383*r + 656*r + 72112 = 320732 for r.
answer: 124

Write down the solution for this math problem: Solve 705*u - 787*u - 410 = 0 for u.
answer: -5

Write down the solution for this math problem: Solve 30 + 6 = 14*b + 4*b for b.
answer:
2