Question: What is the solution?

Solve -39*n - 687 - 49 = 7*n for n.

Answer: -16

Question: What is the solution?

Solve -14*w = -5*w for w.

Answer: 0

Question: What is the solution?

Solve 0 = -3*y + 12 - 9 for y.

Answer: 1

Question: What is the solution?

Solve 666 - 666 = 5*q for q.

Answer:
0