Q: What is the solution?
Solve 1137*i - 4481 - 1915 = 645*i for i.

A: 13

Q: What is the solution?
Solve -1605*y = -688*y - 638*y for y.

A: 0

Q: What is the solution?
Solve -1351*a + 224 = 138*a + 19581 for a.

A:
-13