Solve r + 264 = 67*r for r.
Solve this plz.

A: 4

Solve 416 = 2*z + 408 for z.
Solve this plz.

A: 4

Solve -5259 - 2987 = -42*k - 255*k + 31*k for k.
Solve this plz.

A:
31