Q: Solve 987 + 663 = 110*f for f.

A: 15

Q: Solve 7*z = 11*z + 20 for z.

A: -5

Q: Solve 1760 = 100*d - 363*d - 3763 for d.

A: -21

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

A:
0