$9a^2-6a+5-10a^2+25$
$3\left(x+5\right)-5$
$665-1834+426-399+471$
$\left(2m+9\right)\left(5m-3\right)$
$\lim_{x\to0}\left(\frac{\left(4lnx-4\right)}{x-e}\right)$
$x^2-30x+30$
$\frac{sin^2\theta\:}{1-cos\theta\:}-1=cos\theta\:$
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