$b+7ab-4ab-b$
$4m^3y+5x^2my-7x^2m^2y^2$
$\lim_{x\to0}\left(\frac{e^{-3x^3}-1+3x^3-\frac{9}{2}x^6}{10x^9}\right)$
$2\frac{dy}{dx}+\left(4xy\right)=2x$
$750+250$
$cos\left(t\right)\left(\frac{dy}{dt}\right)+sen\left(t\right)y=1$
$\frac{u-2}{-\left(u-1\right)^2}$
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