$\int\frac{2}{x^3-4x^2-21x}dx$
$\frac{d}{dx}y=x^3-x^2$
$\left(x^2-4y^2\right)\left(x^2+8y^2\right)$
$-\:28x\:-\:20$
$3n+3=51$
$\frac{\left(2x^5+4x\right)}{x-2}$
$x^2-3x-10\le0$
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