Write down the solution for this math problem: Solve -10*a = -20*a + 54*a - 619 + 3039 for a.
answer: -55

Write down the solution for this math problem: Solve 0 = -10*y - 80 + 110 for y.
answer: 3

Write down the solution for this math problem: Solve 0 = 7*a - 8*a for a.
answer: 0

Write down the solution for this math problem: Solve 1468*f - 1447*f - 252 = 0 for f.
answer:
12