Write down the solution for this math problem: Solve -4*k = -140 + 156 for k.
answer: -4

Write down the solution for this math problem: Solve 2157*p = 2174*p - 170 for p.
answer: 10

Write down the solution for this math problem: Solve 84 = 43*u - 294 + 34 for u.
answer: 8

Write down the solution for this math problem: Solve -8 = 19*p - 21*p for p.
answer:
4