$$2(3x^{2}-1)+9=(fog)(x)$$
$f=\frac{6x^{2}+7}{gox}$
$x\neq 0\text{ and }g\neq 0\text{ and }o\neq 0$
$g=\frac{6x^{2}+7}{fox}$
$x\neq 0\text{ and }o\neq 0\text{ and }f\neq 0$
