$x+4+2x-x-5-8x$
$\frac{\left(n\left(n+2\right)^2\right)}{5^n}$
$\int\frac{\left(\sqrt{4-x^2\:}\right)}{2}dx$
$( 3 x + 8 ) ( 3 x - 10 )$
$-4\left(3c^2+44\right)$
$2+6\:x\:5$
$4a+7x-5a-2xa+3x-2a+3x$
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