$x-\frac{1}{x}=\frac{2}{x}$
$27\:\left(+3\right)$
$6x^2-2020$
$\left(2b+7\right)\left(2a_{-7}\right)$
$-2+\frac{5i}{n}$
$\left(a^2+2ab-15^2\right)$
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