$dx+dy+xdy=ydx$
$x\left(y+10\right)^2$
$\left(3x^2+5x-1\right)\cdot\left(-2x\right)$
$\left(-2m^3\right)\left(3m^{-3}\right)$
$4\left(9x^2-y^2\right)$
$3x\left(2x\right)+3x\left(9\right)$
$\lim\:_{x\to\:-\infty\:}\left(-x^2-x+1\right)$
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