64sandal's channel

1. y=x/(1-x)

2. y(1-x)=x

3. y-xy=x

4. y=x+xy

5. y=x(1+y)

6. y/(1+y)=x

7. x=y/(1+y)

If you doubt it, substitute y/(1+y) for x in equation 1 and simplify. Of course, if you couldn't solve the first, you probably have no chance ........