Question: What is the solution?

Solve 12*u - 10 = 7*u for u.

Answer: 2

Question: What is the solution?

Solve -287*n + 72*n + 4828 = -938 - 684 for n.

Answer: 30

Question: What is the solution?

Solve 2*d + 12*d = -30*d - 132 for d.

Answer: -3

Question: What is the solution?

Solve 2 = 4*j - 18 for j.

Answer:
5