$\frac{d}{dx}2x^2-5x+2$
$\left(m-7\right)^2$
$9x^2-12x+7$
$\sqrt{a\sqrt{b}}$
$\lim_{x\to-1}\left(-x^2+7x\right)$
$4+2x<5-4x$
$2x^2\:+13x=7$
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