Q: What is the solution?
Solve -91*q + 1552 = 3463 for q.

A: -21

Q: What is the solution?
Solve 11010 + 12842 = 1187*r + 6047 for r.

A: 15

Q: What is the solution?
Solve -10 = -26*v + 21*v for v.

A:
2