$\frac{u}{2}-5\le-9$
$2x+20=-30$
$\left(x^2-y^3\right)^3$
$x+7^2$
$\left(\frac{2}{3}a-\frac{3}{4}b\right)\left(-\frac{2}{3}a^3b\right)$
$5x\ge-6$
$-7xy^{2}\left(-13x^{4}\right)$
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