Solve 0 = -3*r + 102 - 105 for r.
Solve this plz.

A: -1

Solve -2800 = 201*k + 160*k + 5864 for k.
Solve this plz.

A: -24

Solve 9*d = -9 - 45 for d.
Solve this plz.

A:
-6