Q: Solve 58*u + 67*u + 447 = -2178 for u.

A: -21

Q: Solve 22*c + 405 = -23*c for c.

A: -9

Q: Solve 835*z - 35249 - 10262 = -1705*z - 2331 for z.

A: 17

Q: Solve 20*r + 32*r = -515 + 99 for r.

A:
-8