Q: Solve 0 = -4*a + 12 for a.

A: 3

Q: Solve -19*y + 5*y + 113 = -111 for y.

A: 16

Q: Solve 0 = 1693*y + 3153*y + 322869 + 103579 for y.

A: -88

Q: Solve -356*v + 727*v + 869*v = 1081 - 7281 for v.

A:
-5