Write down the solution for this math problem: Solve 11*x - 2*x = -27 for x.
answer: -3

Write down the solution for this math problem: Solve 19*s = -7*s - 23*s - 392 for s.
answer: -8

Write down the solution for this math problem: Solve -5*f + 12 + 13 = 0 for f.
answer: 5

Write down the solution for this math problem: Solve 9*i = -30 - 6 for i.
answer:
-4