Solve -260725*k = -260911*k - 3534 for k.
Solve this plz.

A: -19

Solve 400 = -65*r + 40*r for r.
Solve this plz.

A: -16

Solve 512*b - 543*b + 62 = 0 for b.
Solve this plz.

A:
2