$3x^4+x^3+3x^2+x$
$3x^2+5y^2-6x-12=0$
$12:-6$
$a^2-13a^2+4$
$\lim_{x\to-4}\left(\frac{x^2+8x+16}{x+4}\right)$
$49n^3-42n^2-14n+12$
$\lim_{x-3}\left(\frac{x^2+6x+9}{x+3}\right)$
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