$10x^2+18xy+4y^2$
$50+x\:=30$
$2x^2-x=6x^2-x$
$\frac{x^2+8}{3}=16$
$\frac{x}{2}=7-\frac{2x}{3}$
$\left(3x^2-5y\right)\left(3x^2+4y\right)$
$\tan\left(\frac{x}{3}\right)\sec^2\left(\frac{x}{3}\right)$
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