Q: Solve -13 = -5*x + 7 for x.

A: 4

Q: Solve -29*r = -5*r + 72 for r.

A: -3

Q: Solve 35*x + 86 + 184 = -55*x for x.

A: -3

Q: Solve 83*d - 284 + 518 + 679 = 0 for d.

A:
-11