Question: What is the solution?

Solve 0 = 2*r - 2*r - 2*r for r.

Answer: 0

Question: What is the solution?

Solve 0 = 11*h - 14 - 8 for h.

Answer: 2

Question: What is the solution?

Solve 38*n - 8*n + 180 = 0 for n.

Answer: -6

Question: What is the solution?

Solve 9 = 3*w - 0 for w.

Answer:
3