$\frac{\left|a-1\right|}{a-1-2}$
$8-4+2-1\:$
$\frac{e^{-1^2}}{2}$
$\left(4.5a+3.3b-1.2\right)+\left(-2.5a+2b+5.3\right)-\left(3.1a-5.3b-4.5\right)$
$\int\tan^2\left(5s\right)ds$
$3x-18=3$
$\left(2x-3y^2\right)\left(2x-4z^3\right)$
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