$\frac{12n^{2}-6n+6}{3n^{2}}$
$\left(10-5\right)^2+13$
$\lim\:_{x\to\:1}\left(\frac{2x^2-x-1}{x-1}\right)$
$3a+2a^2$
$-4x^2-4x+24$
$4x^{3+8}$
$=8x^3\left(7x^6-3x^5\right)$
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