$x^2+7x+1$
$18-\left|2+\left(7-3-8\right)-10\right|$
$x^2+21x-232\:\:\:x=3$
$\left|-13\right|$
$\left(2\cdot4\right)-1+\left(3\cdot5\right)-1$
$\left(8a+2\right)\left(8a-5\right)$
$\int\left(\frac{x^2+2x+3}{x+1}\right)dx$
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