$20+90+513$
$\left(7q+5\right)^2$
$\frac{y^{-7}z}{x^9}$
$x+5\cdot x+5$
$a+1\:\cdot\:a+2$
$3\cdot\left(-5\right)-20\cdot\left(-4\right)+7\cdot\left(+18\right)\:=\:\:$
$\left(-80\right)\cdot\left(+20\right)$
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