$2^2\left(5-3\right)$
$\frac{4x+3}{x^2-25}+\frac{2-3x}{x^2-25}$
$-17-13+67+3+8+13-2$
$81x^2-108xy+36y^2$
$\frac{dy}{dx}=\frac{x-2y}{-2x-y}$
$10\:m\:\:y\:20m$
$7z^2+7$
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