Write down the solution for this math problem: Solve 30 - 10 = h + 1 for h.
answer: 19

Write down the solution for this math problem: Solve -1039*s = 147*s - 102*s + 11924 for s.
answer: -11

Write down the solution for this math problem: Solve 104*a - 101*a + 107*a + 2310 = 0 for a.
answer: -21

Write down the solution for this math problem: Solve -21 = 24*c - 17*c for c.
answer:
-3