$\left(x+2\right)\frac{dy}{dx}-y=1$
$\frac{dy}{dx}+\frac{3y}{x}=3x^2$
$4u=24$
$w^2-28w+139$
$\lim_{x\to a}\left(\frac{1}{x^2\cdot\left(x-a\right)}-\frac{1}{a^2\cdot\left(x-a\right)}\right)$
$\frac{x^2+3x-2}{x+3}$
$\sqrt{\left(12-x\right)}=x$
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