Q: What is the solution?
Solve 6*r = -30*r - 30*r - 1386 for r.

A: -21

Q: What is the solution?
Solve 23*a = 4*a - 114 for a.

A: -6

Q: What is the solution?
Solve -35*l + 124 = -4*l for l.

A:
4