$39.2-2.140$
$\lim_{x\to8}\left(\frac{7+x}{8-x}\right)$
$x-3\le12$
$-1+4-6+2+1+2$
$7\left(8-23\right)$
$8+7-11.1-2.8$
$2x+3a\:a\:5a+3x+7$
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