Q: Solve 0 = -w + 17 - 12 for w.

A: 5

Q: Solve -i + 1476 = 1470 for i.

A: 6

Q: Solve 763 = 19*r + 573 for r.

A: 10

Q: Solve 986 + 68 = -62*b for b.

A:
-17