$\lim_{x\to7}\left(\frac{7-x+ln\left(x-6\right)}{x^3-12\cdot x^2+21\cdot x+98}\right)$
$-5+\left(-9-\left|-9+\left(-9+5\right)-4\right|+2\right)-8$
$\int\frac{x^6}{\left(4x+x^2\right)^2}dx$
$4x^2\left(2x+3\right)$
$\left(1-2x\right)\left(3a-b^2\right)$
$144y^{12}-169f^{16}$
$\lim_{x\to4}\left(\frac{1}{2}x-9\right)$
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