Q: What is the solution?
Solve 2508 = -1119*d + 1231*d + 156 for d.

A: 21

Q: What is the solution?
Solve -9*f = -17 - 28 for f.

A: 5

Q: What is the solution?
Solve -2588*x + 2050*x = 5380 for x.

A:
-10