Write down the solution for this math problem: Solve 72*v - 195*v = 955 - 3415 for v.
answer: 20

Write down the solution for this math problem: Solve -62*k + 1300 = 68*k for k.
answer: 10

Write down the solution for this math problem: Solve -15*w = -33*w + 126 for w.
answer: 7

Write down the solution for this math problem: Solve -83 = 19*u + 12 for u.
answer:
-5