Question: What is the solution?

Solve 0 = -18*n - 42*n - 420 for n.

Answer: -7

Question: What is the solution?

Solve -172*b + 4377 = 8333 for b.

Answer: -23

Question: What is the solution?

Solve 9*c = -5*c + 42 for c.

Answer: 3

Question: What is the solution?

Solve 0 = 141*x + 1385 - 4062 - 1271 for x.

Answer:
28