I am to find y double prime at $x = 0$ given $$xy + 7e^y = 7e$$
I am confused as to how to use the information of $x = 0$. The only $x$ term in the equation is $xy$ which after implicit differentiation becomes just $y$. Then there is no more $x$ in $y'$ or $y''$for me to substitute into. Do I substitute it in before beginning implicit differentiation?