Q: What is the solution?
Solve 55*r - 43 = 67*r - 19 for r.

A: -2

Q: What is the solution?
Solve -25847 - 10680 + 3168 = 1367*i + 3550 for i.

A: -27

Q: What is the solution?
Solve -219*b + 22 + 30 = -215*b for b.

A:
13