$\int_1^3\left(\frac{1}{\sqrt{x^2+x}}\right)dx$
$\left(2x+8\right)\left(2x-6\right)$
$\left(3x^2+5x+2\right)\left(5x^2+3x-1\right)$
$\frac{36x^2-4v^2}{6x+2v}$
$12-x=x-12$
$x^3-7x^2+7x+15$
$5x+24=2x+9$
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