$x^4+6x^3+9x^2-4x-12$
$-703-482$
$-\left(x+4\right)^2$
$2x\le2x-4$
$1\cdot\left(-4\right)\cdot\left(-4\right)$
$-6m+4=4-6m$
$\lim_{x\to\infty}\left(\frac{x^6+3}{x^6-6}\right)$
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