$$n^{2}-5x+6=0$$
$x=\frac{n^{2}+6}{5}$
$n=-\sqrt{5x-6}$
$n=\sqrt{5x-6}$
$n=\sqrt{5x-6}$
$n=-\sqrt{5x-6}\text{, }x\geq \frac{6}{5}$