$11\:-\:\left(\:-\:7\:+\:12\:\right)\:-\:15$
$9n^2-30n-25$
$\tan\:^{-1}\left(\frac{0.3}{1.8}\right)$
$\int\frac{6lnx}{x^5}dx$
$\left(m^7\right)^0$
$\left(-4+4y\right)^2$
$5x-9x-8x-3x-x-2x$
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