Q: What is the solution?
Solve 2499 = -177*n - 156 for n.

A: -15

Q: What is the solution?
Solve -171 = 15*v + 4*v for v.

A: -9

Q: What is the solution?
Solve -4207 + 25617 + 10540 = 2021*o - 10491 for o.

A:
21