The question is:

The numbersx, y, zare succesive terms of a G.S with the sum of the three terms equal to 9. When taken in the ordery, x ,zthe numbers form an A.S. Find the values ofx, y, z?

G.S

A.S

So I have that the sum of the G.S and A.S are equal and therefore I can say that the equations are equal to each other but i just don't know where to go from here or if I'm correct...

Thanks for any help you can give me