$20+\left|-7\right|$
$xy'+4y=5x$
$\left(9^3\right)^{-3}$
$\:\left(\:2a^3\:-\:7b^3\right)^3$
$7+7m=14$
$3\left(-0.5\right)^2\frac{2}{3}+2\:\left(-0.5\right)$
$m^4-36n^2$
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