Q: Solve:
Solve -5*a = 38*a - 86 for a.

A: 2

Q: Solve:
Solve -155 = -39*k + 70*k for k.

A: -5

Q: Solve:
Solve 979*u - 433*u = 472*u - 256 + 2550 for u.

A:
31