Question: What is the solution?

Solve 312 - 244 = -19*h - 331 for h.

Answer: -21

Question: What is the solution?

Solve 643*u - 644*u = -1 for u.

Answer: 1

Question: What is the solution?

Solve -509 - 2026 = -1553*j + 1618*j for j.

Answer: -39

Question: What is the solution?

Solve 12*a = 14 - 38 for a.

Answer:
-2