$2x^2+8x+5x^2-2x+2x^2$
$\lim_{x\to4}\left(\frac{y^2-16}{\sqrt{y}-2}\right)$
$\left(2x^2+6x\right)-\left(3x^2-5x\right)$
$y-3y^2$
$-\frac{90}{3}$
$\left(\sqrt{7}+\sqrt{3}\right)\left(\sqrt{7}-\sqrt{3}\right)$
$\frac{x-3y}{3}-2y-5$
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