Question: What is the solution?

Solve 0 = 43*q - 34*q + 54 for q.

Answer: -6

Question: What is the solution?

Solve 31 = -55*z + 86*z for z.

Answer: 1

Question: What is the solution?

Solve 4 = -7*u - 31 for u.

Answer: -5

Question: What is the solution?

Solve 40 = -18*n + 10*n for n.

Answer:
-5