Problem: Math Problem
Solve 65*r = 457 - 2187 - 545 for r.

A: -35

Problem: Math Problem
Solve -24*z - 2*z + 12*z = 140 for z.

A: -10

Problem: Math Problem
Solve 0 = 22*n - 86649 + 86451 for n.

A:
9