$\left(x^3+4\right)\left(x^3-2\right)$
$y''+16y=0$
$-10n+10n=0$
$x^2+2x+7=0$
$5ab\left(-2a+b\right)$
$\frac{\left(2x+1\right)}{x+2}<1$
$\frac{2-x}{x^2-4}$
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