Solve 2242 - 461 + 104 = 145*x for x.
Solve this plz.

A: 13

Solve 154409*b + 130 = 154379*b - 350 for b.
Solve this plz.

A: -16

Solve 15 = 7*k - 4*k for k.
Solve this plz.

A:
5