Q: What is the solution?
Solve -20*v + 27 = -13 for v.

A: 2

Q: What is the solution?
Solve -13*b + 35 - 87 = 0 for b.

A: -4

Q: What is the solution?
Solve 953*r = -778*r - 3462 for r.

A:
-2