Q: Solve d - 67 = -69 for d.

A: -2

Q: Solve 0*s = -8*s - 16 for s.

A: -2

Q: Solve 1038*u = -585*u + 1941*u + 2743*u + 306100 for u.

A: -100

Q: Solve -4*f = 71 - 91 for f.

A:
5