Question: What is the solution?

Solve 0 = -1724*r + 23287 + 21824 + 20401 for r.

Answer: 38

Question: What is the solution?

Solve -811*r + 23 - 23 = 213*r for r.

Answer: 0

Question: What is the solution?

Solve -2898*c - 44047 = -307*c for c.

Answer: -17

Question: What is the solution?

Solve -92*d + 686 = 42 for d.

Answer:
7