Write down the solution for this math problem: Solve -2 = 23*u + 90 for u.
answer: -4

Write down the solution for this math problem: Solve -1487*f - 7176*f - 151366 = 357*f + 173354 for f.
answer: -36

Write down the solution for this math problem: Solve -113*a + 107*a = 18 for a.
answer: -3

Write down the solution for this math problem: Solve 418 = 22*g + 770 for g.
answer:
-16