Write down the solution for this math problem: Solve k - 8*k - 70 = -17*k for k.
answer: 7

Write down the solution for this math problem: Solve -2*u = -6 + 12 for u.
answer: -3

Write down the solution for this math problem: Solve -23*x = 66 + 582 - 50 for x.
answer: -26

Write down the solution for this math problem: Solve 0 = 20*u + 85 + 15 for u.
answer:
-5