Write down the solution for this math problem: Solve 0 = 13*p + 81 - 211 for p.
answer: 10

Write down the solution for this math problem: Solve -217*o + 1105 + 288 = -126 for o.
answer: 7

Write down the solution for this math problem: Solve -490276*a = -490231*a - 945 for a.
answer: 21

Write down the solution for this math problem: Solve 310*v - 896 + 5236 = 0 for v.
answer:
-14