Write down the solution for this math problem: Solve 12*r + 42 = -6 for r.
answer: -4

Write down the solution for this math problem: Solve 30*i = 28*i + 4 for i.
answer: 2

Write down the solution for this math problem: Solve -7*l = 98 - 126 for l.
answer: 4

Write down the solution for this math problem: Solve -18529 - 12010 = 1455*z + 4381 for z.
answer:
-24