$2m+9\:\:2m-9$
$4-3-8x$
$8\cdot02$
$5.\left(-8\right)\:+\:\left(-3\right).\left(-4\right)$
$\sqrt[8]{1}$
$\lim_{x\to\infty}\left(\frac{x+8}{x+7}\right)^2$
$7x+6<41$
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