$x^2=\:-\:2x\:-\:3$
$\log\left(8\right)+\log\left(x-3\right)=3$
$-4\cdot7+2$
$3b\left(-9-7b\right)+7b^2$
$\left|21-8\right|$
$-4x^2+18x-47=-6x^2+34x-71$
$\frac{d}{dx}\left(\sqrt{\cos\left(2t\right)}\right)$
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