Q: Solve:
Solve 451*d - 549 = -1000 for d.

A: -1

Q: Solve:
Solve -880 = -354*x + 2306 for x.

A: 9

Q: Solve:
Solve 136*u + 3612 = 239*u - 5864 - 309 for u.

A:
95