Write down the solution for this math problem: Solve 31*c + 20 + 104 = 0 for c.
answer: -4

Write down the solution for this math problem: Solve -172*z + 181*z = -365*z - 9350 for z.
answer: -25

Write down the solution for this math problem: Solve 0 = 381*x - 377*x - 16 for x.
answer: 4

Write down the solution for this math problem: Solve 0 = 47*s + 527 - 339 for s.
answer:
-4