$\frac{1}{4}\left(16v-7\right)$
$5xy-y=9x+4y$
$\left(13x-7\right)\left(17x+7\right)$
$3x^2-6x-9$
$r2\:-\:5r\:+\:6$
$\frac{10.000}{0.00001}$
$cotx-2cot2x=tanx$
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