$6x^2-48x+72$
$\left|6-12\right|-\left|-4\right|$
$-n\:+\:9n\:+\:3-8\:-\:8n$
$\frac{a^2-64b^2}{a+8b}$
$4x^2-48x+16$
$4x^2-5x+6$
$\frac{d}{ds}\left(e^{\frac{s}{t}+\frac{2t}{s}}\right)$
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