$3x+6x^2$
$x-7^2+7\left(x-7\right)+6$
$6n^2-5n+1$
$a^2-2ab+b^2+2\left(ab-b^2\right)+b^2$
$2x+y=15$
$\lim_{x\to+\infty}\left(\frac{ln\left(x^2-1\right)+x^2}{x^2+x+1}\right)$
$x^2-x-132$
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