Write down the solution for this math problem: Solve 46*k - 216 = -27*k + 64*k for k.
answer: 24

Write down the solution for this math problem: Solve 51*x + 380835 = 1534*x + 2151*x - 379*x for x.
answer: 117

Write down the solution for this math problem: Solve -21*u = -25*u - 20 for u.
answer: -5

Write down the solution for this math problem: Solve -868 = 103*s - 1795 for s.
answer:
9