Question: What is the solution?

Solve 8*c = 15*c + 70 for c.

Answer: -10

Question: What is the solution?

Solve -42925 = 334*z - 2051*z for z.

Answer: 25

Question: What is the solution?

Solve 18 = 1401*l - 1398*l for l.

Answer: 6

Question: What is the solution?

Solve 180*r + 12969 = 10629 for r.

Answer:
-13