Q: What is the solution?
Solve 0 = 2*r - 20*r + 45 - 45 for r.

A: 0

Q: What is the solution?
Solve 0 = -40*v + 44*v + 20 for v.

A: -5

Q: What is the solution?
Solve -691*y + 2745*y - 143780 = 0 for y.

A:
70