$7x+y\:\:-8y-3z$
$\sqrt{\frac{25-x^2}{x}}$
$\left(-4\sqrt{2k}-3\right)\left(-4\sqrt{2}-5\right)$
$\log\left(w^2+21\right)=\log\left(10w\right)$
$\frac{d}{dx}\left(-y+x^2=sin\left(xy\right)\right)$
$\left(10x+2\right)\left(10x-8\right)$
$\left(4xyz-2x^2y\right)^2$
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