$\frac{2}{3}x-2x$
$b^2-18b+b$
$-12+5\left(-3\right)^2$
$\frac{x}{3}<4$
$-4\left(-7r-1\right)+5r$
$\sin\left(\frac{\pi}{4}-x\right)$
$arccsc\left(\sin\left(\frac{\pi}{6}\right)\right)$
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