Q: Solve:
Solve 0 = -15*p + 5784 - 5619 for p.

A: 11

Q: Solve:
Solve r + 20 = 21 for r.

A: 1

Q: Solve:
Solve 0 = -3442*i + 6877*i - 3441*i - 24 for i.

A:
-4