Solve -13884 = -906*f + 4541 - 2117 for f.
Solve this plz.

A: 18

Solve -46*a + 44*a + 8 = 0 for a.
Solve this plz.

A: 4

Solve 163*x - 77*x + 8148 = -108*x for x.
Solve this plz.

A:
-42