Write down the solution for this math problem: Solve 166*o + 264*o - 6450 = 0 for o.
answer: 15

Write down the solution for this math problem: Solve -979 - 2559 = 247*u + 167 for u.
answer: -15

Write down the solution for this math problem: Solve -21657*k + 6120 = -43315*k + 21828*k for k.
answer: 36

Write down the solution for this math problem: Solve 0 = 202*i + 36*i + 39*i - 4155 for i.
answer:
15