Write down the solution for this math problem: Solve 667 = 159*c - 605 for c.
answer: 8

Write down the solution for this math problem: Solve -29*o + 0*o - 144 - 324 = 7*o for o.
answer: -13

Write down the solution for this math problem: Solve 120*v - 78*v - 84 = 0 for v.
answer: 2

Write down the solution for this math problem: Solve -90*n = -67*n + 69 for n.
answer:
-3