$2\ln\left(x-3\right)-\ln\left(x^2-9\right)$
$16k^2+96k^3+144k^2-72k^2-216k+81$
$m^5m\:m^3m$
$\frac{2}{5}y-4+7-\frac{9}{10}y$
$a^2-a-6$
$\int\left(\left(3x^2-4x\right)e^{2x}\right)dx$
$-3\cos-\sqrt{3}=0$
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