Question: What is the solution?

Solve -89*d - 150 = -558 - 126 for d.

Answer: 6

Question: What is the solution?

Solve 0 = -99*x + 29*x + 280 for x.

Answer: 4

Question: What is the solution?

Solve -22 + 2 = 5*f for f.

Answer: -4

Question: What is the solution?

Solve -18*l + 14*l = 7 - 19 for l.

Answer:
3