Question: What is the solution?

Solve -253*r = 58*r + 7464 for r.

Answer: -24

Question: What is the solution?

Solve -486 = -98*i + 494 for i.

Answer: 10

Question: What is the solution?

Solve -21 + 16 = -i for i.

Answer: 5

Question: What is the solution?

Solve 79*n - 73*n = 12 for n.

Answer:
2