Write down the solution for this math problem: Solve -80*b + 81*b - 8 = 0 for b.
answer: 8

Write down the solution for this math problem: Solve -43 + 13 = 6*w for w.
answer: -5

Write down the solution for this math problem: Solve -2506*q + 1218 = -2400*q - 690 for q.
answer: 18

Write down the solution for this math problem: Solve 680*r - 115 = 347*r + 346*r + 210 for r.
answer:
-25