Write down the solution for this math problem: Solve 12677*r - 12696*r = 133 for r.
answer: -7

Write down the solution for this math problem: Solve 57 = 10*d + 28 + 319 for d.
answer: -29

Write down the solution for this math problem: Solve 10225*d - 357379 = -11452*d + 1262253 - 15534 for d.
answer: 74

Write down the solution for this math problem: Solve 66*o = 37*o + 116 for o.
answer:
4