$-\frac{1}{2}\left(-\frac{1}{2}x\right)$
$97.25+\left(-105.3\right)$
$9y\:+\:9y^2$
$\left(80\right)+\left(-70\right)-\left(-20\right)-\left(+100\right)$
$\int y^2\:sin\left(8y\right)\:dx$
$15x^2+20x+25$
$\left(xy^{3}\cdot2^{-6}-2z\right)^{2}$
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