$\left|-9-1\right|$
$\frac{x^2-4x}{3-x^2}$
$-2.5-0.5$
$\frac{d^2}{dx^2}\left(3x^2+2x+1\right)$
$\int\sqrt{8}abdx$
$80\:+\:100e^0$
$126x^9-64y^6z^{15}$
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