Q: Solve 0 = 323*b - 497*b + 243*b - 621 for b.

A: 9

Q: Solve 75*d = -69*d - 864 for d.

A: -6

Q: Solve y + 4 = 3 for y.

A: -1

Q: Solve 217*c - 309 = 320*c for c.

A:
-3