$13-5x+\left(7x\right)$
$\frac{dy}{dx}=\frac{1-e^{-2x}}{e^x-e^{-x}}$
$\left(x^2\right)\left(\sqrt{x}\right)$
$\frac{x+1}{\left(x-4\right)}\cdot\frac{1}{\left(x+2\right)}$
$\frac{dy}{dx}=\frac{y^3}{3x+1},\:y\left(0\right)=-1$
$5x-7\le-12$
$-3x^2+7x+6=0$
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