$3x^2-7x-20$
$\left(5-x\right)\:\left(x\:+\:7\right)$
$\:-6x\:-\:2\:=\:70$
$-\:60\:\:15\:-\:\left(\:-\:20\:\right)\:\:\left(\:10\:\right)$
$\int\left(\frac{\cos\left(3x\right)}{2}\right)dx$
$\left(x^2-6x-7\right)+\left(x^2+4x-6\right)$
$5a^4-5$
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