Q: What is the solution?
Solve -165 = 54*d - 21*d for d.

A: -5

Q: What is the solution?
Solve 0 = 138*k + 2344 + 692 for k.

A: -22

Q: What is the solution?
Solve -39*v + 29*v = 13*v - 644 for v.

A:
28