$250-\left(6-4+5\right)-8-\left(9-5+3\right)$
$\frac{x^a}{x^2}$
$\frac{120}{-60}$
$-4\left(x+\frac{1}{2}\right)>3+\frac{3}{2}x$
$\sqrt{98a^3}b^5c^7$
$\left(p^{10}\right)^4$
$-6ad+a-5ad-7a-ad$
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