Write down the solution for this math problem: Solve -316*k + 87*k - 7122 = 981*k - 23*k for k.
answer: -6

Write down the solution for this math problem: Solve 0 = -7*w + 122 - 157 for w.
answer: -5

Write down the solution for this math problem: Solve 6*i = 3*i - i - 16*i - 1180 for i.
answer: -59

Write down the solution for this math problem: Solve 9*x + 18 = 3*x for x.
answer:
-3