Q: Solve 0 = -21*v + 25559 - 25832 for v.

A: -13

Q: Solve 3*c - 6*c + 9 = 0 for c.

A: 3

Q: Solve 0 = -823*z + 1307124 - 1403415 for z.

A: -117

Q: Solve 0 = 26*f - 0 - 0 for f.

A:
0