$\lim_{x\to-2}\left(\frac{x^2+5x+6}{4+x^2}\right)$
$ax+3ax+8ax$
$\sqrt{2475n^5y^4}$
$121x^2+44xy+4y^2$
$2x-7\ge4x-2$
$4\left(3x^4-13x^3+20x-6\right)$
$\left(y+2\right)x^2$
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