$2ab\left(3-x\right)+cd\left(3-x\right)$
$9-\:6\:-\:\left[\:\left(-32\:-\:15\:+8\right)\:-\:22\right]\:-\:7$
$\left(\frac{9^7}{9^3}\right)^2$
$x^2-2x-169$
$\frac{\sqrt{2}}{\sqrt{5}+x}$
$\int\frac{x}{\sqrt{x^4+25}}dx$
$c^4-16$
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