$\left(6x+12\right)\left(6x-18\right)$
$2x^3-18x^3+53^2+54x$
$\lim_{x\to\infty}\left(\frac{2z^3-3z^2+1}{2z^5+7}\right)$
$x^2=9y$
$7\left(2x+5\right)$
$2x^3y^2+\frac{y^4}{9}$
$\left(5a^2-4\right)\left(8a^2-4\right)$
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