Write down the solution for this math problem: Solve 419*m = 113*m - 171*m + 8247 - 138 for m.
answer: 17

Write down the solution for this math problem: Solve -121*k = -112*k - 27 - 18 for k.
answer: 5

Write down the solution for this math problem: Solve 68*z - 63*z = 5 for z.
answer: 1

Write down the solution for this math problem: Solve 0 = 5*c - 511 + 516 for c.
answer:
-1