$\left(2a+6\right)\left(x-6\right)$
$a+5a+5$
$\frac{1}{5\:}ax+\frac{1}{10}ax+ax$
$-8\:-\:\left[21\::\:\left(-3\right)\right]\:+\:\left[6\:x\:\left(-2\right)\:-\:7\right]\:$
$\frac{x^3-8}{x^2+4}$
$\lim_{x\to\infty}\left(9x\left(e^{\frac{2}{x}}-1\right)\right)$
$-3a\:si\:a=4$
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