Q: What is the solution?
Solve -108*i = -78*i + 174 + 216 for i.

A: -13

Q: What is the solution?
Solve -74*d + 125 - 218 = 129 for d.

A: -3

Q: What is the solution?
Solve -28 = 5*u - 12*u for u.

A:
4