$23nm+13nm$
$-2x>-8$
$\frac{60}{20}$
$10x^5y-30xy^2$
$2-2x\le9-4x$
$\frac{27}{3}-9$
$-2\left(-5\right)\cdot\left(-10\right):2-\left(6-\left(-4\right)\cdot\left(-9\right)\right)$
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