Q: What is the solution?
Solve -4 = -3*a - 10 for a.

A: -2

Q: What is the solution?
Solve -32 - 469 - 559 = 70*k + 130 for k.

A: -17

Q: What is the solution?
Solve -64*u + 816 = -16 for u.

A:
13