$\frac{7x^2-70x+63}{x-9}$
$\frac{x^2+4x+4}{x^2-1}$
$15+x-4$
$\lim_{x\to0}\left(\frac{\left(8tanx-7sinx\right)}{x^2}\right)$
$x^2-50x+25=0$
$\left(-11\right)\left|\left(-10\right)+\left(-1\right)\right|$
$3-9\cdot6+4$
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