Q: Solve -490*a + 546*a - 24021 - 1404 = -1639*a for a.

A: 15

Q: Solve -7864 + 7875 = -11*a for a.

A: -1

Q: Solve -12 = -4*u + 16*u for u.

A: -1

Q: Solve 1617 - 1141 = -68*z for z.

A:
-7