$\left(-4\right)\cdot\left(-24+19\right)^2+5\cdot20$
$2.\left(10+1\right)$
$\left(x^3+x^2-6\right)x\:\left(x^2+x+1\right)$
$n^{12}-216$
$\frac{d^2}{dx^2}\left(\frac{x\:y}{x-y}\right)$
$-2x-15\ge90$
$\frac{x^6}{x^4}$
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