Question: What is the solution?

Solve -84 = -15*g + g for g.

Answer: 6

Question: What is the solution?

Solve 0 = -9*l + 4 - 40 for l.

Answer: -4

Question: What is the solution?

Solve 40*r = 84 - 364 for r.

Answer: -7

Question: What is the solution?

Solve 14*i + 49*i + 70*i - 27*i = -7950 for i.

Answer:
-75