Question: What is the solution?

Solve 0 = 213*s - 239 + 3057 - 1327 for s.

Answer: -7

Question: What is the solution?

Solve 0 = 13*l - 3*l - 40 for l.

Answer: 4

Question: What is the solution?

Solve -12 + 12 = 4*u - 24 for u.

Answer: 6

Question: What is the solution?

Solve 383*j - 785*j = 6884 + 9196 for j.

Answer:
-40