$\left(+18\right):\left(+6\right):\left(+1\right)$
$\:10x-3=17$
$5+\left(-3\right)-\left(-2\right)+\left(4-6\right)-\left|3-\left(6-4\right)\right|$
$\left(19+r\right)\left(19-r\right)$
$\left(9x^2-18x+18\right)e^{-6x}$
$xy+4y=x^{-3}e^x$
$-7ab+4ab-5ab$
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