Question: What is the solution?

Solve 127*w + 384351214 = 384353881 for w.

Answer: 21

Question: What is the solution?

Solve -846 = -54382*r + 54288*r for r.

Answer: 9

Question: What is the solution?

Solve -1438*a - 29230 = 5282 for a.

Answer: -24

Question: What is the solution?

Solve 38*d - 140 = 58*d + 260 for d.

Answer:
-20