Q: Solve:
Solve 216*a - 10794 = 908*a + 2207*a + 21095 for a.

A: -11

Q: Solve:
Solve 4021*z - 2520 = 8114*z - 4023*z for z.

A: -36

Q: Solve:
Solve 61*y = -369 + 3 for y.

A:
-6