Question: What is the solution?

Solve 0*u + 7*u = 17*u for u.

Answer: 0

Question: What is the solution?

Solve 5*q = -749 + 809 for q.

Answer: 12

Question: What is the solution?

Solve 92 - 84 = 4*j for j.

Answer: 2

Question: What is the solution?

Solve -61 + 41 = 5*x for x.

Answer:
-4