$4x^2-4x-15$
$2\left|x\right|2$
$5\cdot1-7-1-7+8\cdot4$
$( 4 p q - 3 q ) ^ { 2 }$
$\frac{3x}{2}+\frac{2x}{3}$
$\left(\frac{2}{3}x+\frac{1}{2}\right)\left(\frac{2}{3}x-\frac{1}{2}\right)$
$y'=\:2x$
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