Q: What is the solution?
Solve 57 + 290 = 131*f - 23*f + 23 for f.

A: 3

Q: What is the solution?
Solve -1721*i = -2091*i - 13690 for i.

A: -37

Q: What is the solution?
Solve -243*a + 838 + 791 - 657 = 0 for a.

A:
4