Q: What is the solution?
Solve 75*i - 679*i = 3020 for i.

A: -5

Q: What is the solution?
Solve 0 = 254*u - 99*u - 101*u - 154*u + 6400 for u.

A: 64

Q: What is the solution?
Solve 0 = 1529*d - 1816*d - 2870 for d.

A:
-10