Q: Solve 486*r - 860*r + 1122 = 0 for r.

A: 3

Q: Solve 560 = 26*x + 222 for x.

A: 13

Q: Solve 23*y - 729 = -45*y + 21*y + 2655 for y.

A: 72

Q: Solve -28 = 19*b - 142 for b.

A:
6