$4x+3y+-5y+3xy+y$
$xy'+y=2x$
$8.9+6$
$225x^4y^2-16w^6$
$\frac{dy}{y^2}=-2ydx$
$\lim_{x\to2}\left(10x^2-25x-15\right)$
$7x-\:1\le10x+4$
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