Solve 165*a - 249*a + 2772 = 0 for a.
Solve this plz.

A: 33

Solve -2993*c + 260429 = -1045*c + 1939*c for c.
Solve this plz.

A: 67

Solve 52*f = -18*f + 16*f - 486 for f.
Solve this plz.

A:
-9