Q: Solve -615 = 111*r + 828 for r.

A: -13

Q: Solve -10246 + 3281 = -897*v + 4696 for v.

A: 13

Q: Solve 11*o - 16*o = -15 for o.

A: 3

Q: Solve 216*z - 8677 = 764*z + 3379 for z.

A:
-22