$( 1 + y ^ { 2 } ) d x = - x y d y$
$\left(3-3e\right)^3$
$-5a\:entre\:-a$
$\left(2xy+4z\right)\left(2xy-4z\right)$
$-74-32$
$2x+5=17$
$\frac{d}{dx}\frac{1+x}{1-x}$
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