Write down the solution for this math problem: Solve 630*b - 621*b = -45 for b.
answer: -5

Write down the solution for this math problem: Solve 0 = -74*y - 282805 + 281177 for y.
answer: -22

Write down the solution for this math problem: Solve 0 = -305*d + 335*d + 120 for d.
answer: -4

Write down the solution for this math problem: Solve 850*o + 44802 + 41224 = -11724 for o.
answer:
-115