$2\left(\frac{2}{3}x+\frac{xy}{4}\right)^2$
$-9r\:-\:10\:+\:4r\:+\:3.5$
$\left|-15\right|-\left|7\right|$
$15\cdot80+30$
$\left(3e^2-7f\right)^3$
$3z-3\:\le6\:$
$7n-16=47$
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