$-4\:+\:11\:x\:7\:+\:5$
$2k-k$
$\left(3c-5\right)\left(8c-5\right)$
$a^2-8a+15$
$x^2+2x-80=0$
$\lim_{x\to2}\left(\frac{2e^x-4x-2}{x^2+x-ln\left(1+x\right)}\right)$
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