Write down the solution for this math problem: Solve 39*h = 66*h - 189 for h.
answer: 7

Write down the solution for this math problem: Solve 1919*s - 3595*s = 186036 for s.
answer: -111

Write down the solution for this math problem: Solve -2 = 2*z - 10 for z.
answer: 4

Write down the solution for this math problem: Solve 712 + 935 = -165*k - 498 for k.
answer:
-13