$4-7-8-9-3+18$
$9x^2+25x+20x$
$-\left(x-3\right)\left(x+4\right)$
$\sqrt[3]{-48a^6b^9}$
$\frac{2a^4-3a^2+a-1}{a^3}$
$\left(37+86+\:-15+\:\left[36+46-171\right]+\:\left[15+\:\left(20-350\right)-263\right]-12\right)$
$-\frac{x}{3}<2x+1$
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