Respuesta :

Answer:

Step-by-step explanation:

[tex]\frac{y-x}{y+x}=z\\\\ y-x=z(y+x)\\\\y-x=zy+zx \\\\y-zy=x+zx \\\\\\y(1-z)=x(1+z)\\\\x=y*\frac{1-z}{1+z}[/tex]