Q: What is the solution?
Solve 38*u - 40*u - 6 = 0 for u.

A: -3

Q: What is the solution?
Solve 13*x - 34*x = 0 for x.

A: 0

Q: What is the solution?
Solve 163*k = -130*k + 4270 - 168 for k.

A:
14