Question 696952

{{{(n+3)(2n+3)=(n+2)^2+(n-2)^2}}}



{{{2n^2+3n+6n+9=n^2+4n+4+n^2-4n+4}}}


{{{cross(2n^2)+9n+9=cross(2n^2)+8}}}


{{{9n+9=8}}}


{{{9n=8-9}}}


{{{9n=-1}}}


{{{n=-1/9}}}