Q: Solve:
Solve -410 = -251*a + 3170 - 493 + 6451 for a.

A: 38

Q: Solve:
Solve -2573*z - 1741*z = 777*z - 91972 - 177851 for z.

A: 53

Q: Solve:
Solve 12036 = -3065*r - 13325 - 2224 for r.

A:
-9