Write down the solution for this math problem: Solve -171*b + 7560 - 57260 = 1680*b - 76*b for b.
answer: -28

Write down the solution for this math problem: Solve 9*a = 12 - 12 for a.
answer: 0

Write down the solution for this math problem: Solve -2*o - 167 = -169 for o.
answer: 1

Write down the solution for this math problem: Solve -62*a + 2*a - 202 = 398 for a.
answer:
-10