Write down the solution for this math problem: Solve -2*u + 1 = -9 for u.
answer: 5

Write down the solution for this math problem: Solve 23*p + 24 = 31*p for p.
answer: 3

Write down the solution for this math problem: Solve 0 = 65*a + 41*a + 636 for a.
answer: -6

Write down the solution for this math problem: Solve 3822*v = 8045*v - 126690 for v.
answer:
30