$\frac { 12 n ^ { 2 } - 8 n } { 2 n }$
$p^2-21p+20$
$15\cdot15\cdot15$
$4^2x\:y^{-2}$
$\left(3x-2y\right)^2\:$
$10\frac{dy}{dx}+2y=16$
$y'=3y-y^2$
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