$x^2-2x-169$
$\lim_{x\to4}\left(\frac{x^2-10x+24}{x-4}\right)$
$2a^2b+ab^2+2ab$
$\left(3y^2x+5xy^2\right)+\left(4xy+3x+2y\right)$
$\lim_{x\to0}\left(\frac{ln\left(x\right)}{x^2+1}\right)$
$81x^2-648$
$b^2+3+2b^2+4-7$
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