Write down the solution for this math problem: Solve -5*w = 21*w - 130 for w.
answer: 5

Write down the solution for this math problem: Solve -8*z + 18 = -14*z for z.
answer: -3

Write down the solution for this math problem: Solve -4*k = 46 - 74 for k.
answer: 7

Write down the solution for this math problem: Solve 15*r + 49*r - 1879 + 151 = 0 for r.
answer:
27