Q: Solve:
Solve -6 = 2*r + 2 for r.

A: -4

Q: Solve:
Solve -10*c + 48349 + 54146 + 13803 = -829*c for c.

A: -142

Q: Solve:
Solve 13190 = -5*x - 8*x - 6*x + 13361 for x.

A:
9