Solve -198*u - 267*u = -86*u + 7959 for u.
Solve this plz.

A: -21

Solve -11*t + 44*t = -99 for t.
Solve this plz.

A: -3

Solve -629*a - 12 = -644*a + 18 for a.
Solve this plz.

A:
2