$\frac{x^3+4x^2+x-2}{x+1}$
$\left(x-2\right)\left(x+2\right)\ge0$
$2x+9\ge6x$
$\left(15x-6\right)^2\left(5\right)$
$f\left(x\right)=x^2+7x+6$
$730x^2-690x$
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