$8 x ^ { 3 } + 18 x ^ { 2 } - 86 x - 30$
$y'=\frac{x-y}{\:2x}$
$1+\frac{6}{n}+\frac{9}{n}$
$\frac{x}{3}>8$
$\frac{x^3-46x+22}{x+7}$
$\left(2b+5\right)\left(2b-6\right)$
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