$\frac{dy}{dx}\cdot\left(y-x\right)=x+y$
$4\left(3x-2\right)-2\left(4x+5\right)$
$\frac{dy}{dx}=\frac{x-y}{2}$
$\left(13n^5\right)^2$
$-15+45+15$
$\left(2+a\right)\left(a^2-1\right)$
$\:a\left(x+4\right)+b\left(x-3\right)=4x+9$
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