Q: Solve -55*x = 422 + 293 for x.

A: -13

Q: Solve -79 + 69 = 10*u for u.

A: -1

Q: Solve 273*c - 484*c - 90504 = 1159*c + 306*c for c.

A: -54

Q: Solve 4*a + 135*a - 172*a + 66 = 0 for a.

A:
2