Question: What is the solution?

Solve 638428*i + 624 = 638412*i for i.

Answer: -39

Question: What is the solution?

Solve 3*a - 2353308 = 7*a - 2353496 for a.

Answer: 47

Question: What is the solution?

Solve -4 = 4*k + 4 for k.

Answer: -2

Question: What is the solution?

Solve 0 = 10*z + 6*z - 48 for z.

Answer:
3