Q: Solve -64*d + 15 - 75 - 324 = 0 for d.

A: -6

Q: Solve -11 - 22 = 11*s for s.

A: -3

Q: Solve 39*r - 15*r = -240 for r.

A: -10

Q: Solve 0 = 5*y - 9 + 14 for y.

A:
-1