$\lim_{x\to8}\left(\frac{3+x}{x\left(x-8\right)}\right)$
$1.414+3.141+0.285-\left(0.163\right)$
$\frac{x-25}{4}\:=\frac{x-25}{4}\:+\:25$
$x^2+4x+4=49$
$b-b-b$
$\frac{5x+2}{\:6\:\:\:\:\:\:\:\:\:\:\:\:}-12>-5$
$5a-3b+2a+7b-4a-4b$
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