Solve -4*n - 7399 = -7347 for n.
Solve this plz.

A: -13

Solve -22*z + 781 = 63*z - 14*z for z.
Solve this plz.

A: 11

Solve 0 = -r - 172*r + 2284 - 554 for r.
Solve this plz.

A:
10