$x+2\:.\:4x^{-2}$
$\left(x-y\right).12=12y-12x$
$\frac{x^2-x-2}{x-2}$
$05m+06m+07m+08m$
$\frac{d}{dx}\left(xy^3=125\right)$
$x^2+2x-3^2$
$\sqrt{\frac{2}{a}}$
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