Solve -137*j + 2523 - 2499 = -4440 - 1427 for j.
Solve this plz.

A: 43

Solve 19806*r - 1638 = 19988*r for r.
Solve this plz.

A: -9

Solve 686*f + 3724 = -721*f + 2054*f - 723*f for f.
Solve this plz.

A:
-49