Question: What is the solution?

Solve 5*r - 387 = -392 for r.

Answer: -1

Question: What is the solution?

Solve 0 = -22*v - 24959 + 25003 for v.

Answer: 2

Question: What is the solution?

Solve -391*l + 395*l = 28 for l.

Answer: 7

Question: What is the solution?

Solve 0 = 98*i - 72*i - 182 for i.

Answer:
7