How can one solve this equation in $Z^2$?! Ho can one solve the egality $2x+3y=xy$ ? I have to find a value of $x$ in fonction of $y$ so ? I have to add somthing and substrate it I added -2xy then $2x(1+y)-3y(1+x)=0$ Here im suck Can someone help me ?!

Think about the formula $(x-3)(y-2)$.