Q: What is the solution?
Solve -330*a + 624001 = 608821 for a.

A: 46

Q: What is the solution?
Solve -224*d + 1131 = -311*d for d.

A: -13

Q: What is the solution?
Solve -15*r + 1267 - 1657 = 0 for r.

A:
-26