Question: What is the solution?

Solve -37*a = -28*a - 63 for a.

Answer: 7

Question: What is the solution?

Solve 117*j = 110*j + 7 for j.

Answer: 1

Question: What is the solution?

Solve 62*i + 640 = 142*i for i.

Answer: 8

Question: What is the solution?

Solve 0*s = 2*s + 6 for s.

Answer:
-3