Write down the solution for this math problem: Solve 27*c - 921 + 624 = 0 for c.
answer: 11

Write down the solution for this math problem: Solve -10*u - 10*u = -20 for u.
answer: 1

Write down the solution for this math problem: Solve -8889 = 589*a + 16346 - 7901 + 22718 for a.
answer: -68

Write down the solution for this math problem: Solve -6*c - 2*c + 24 = 0 for c.
answer:
3