Question: What is the solution?

Solve 2 + 7 = 5*n - 14*n for n.

Answer: -1

Question: What is the solution?

Solve 0 = 39*i + 12*i + 68 - 17 for i.

Answer: -1

Question: What is the solution?

Solve 117*q + 55 = 128*q for q.

Answer: 5

Question: What is the solution?

Solve -3562 - 8210 = 5*v + 40*v + 63*v for v.

Answer:
-109