Write down the solution for this math problem: Solve 595 - 2733 = -668*h + 3874 for h.
answer: 9

Write down the solution for this math problem: Solve 0 = -195*u + 31*u - 2132 for u.
answer: -13

Write down the solution for this math problem: Solve -528*r - 208 + 1691 = -629 for r.
answer: 4

Write down the solution for this math problem: Solve 0 = 351*a + 22651 - 28969 for a.
answer:
18