Solve -630 = 498*w - 266*w - 241*w for w.
Solve this plz.

A: 70

Solve -3*o = -3 - 0 for o.
Solve this plz.

A: 1

Solve 0 = -13*a - 3 - 49 for a.
Solve this plz.

A:
-4