Q: What is the solution?
Solve -138*d - 487 = -214 + 279 for d.

A: -4

Q: What is the solution?
Solve -37*f = -18*f - 171 for f.

A: 9

Q: What is the solution?
Solve -31792*a + 31873*a + 1458 = 0 for a.

A:
-18