$-7m\:-\:6\left(13\:-\:11m\right)$
$-9-\left(-8\right)$
$\frac{a^2\left(4-9b^2\right)}{36}$
$-\:115\:+\:\left(-\:75\right)\:+\:32\:+\:187\:-\:417\:+\:87\:$
$\:\left(-3^3\right)x^{-4}yz^{-8}$
$13-\left(-2\right)\times\left(-5\right)+1$
$0,5mn^2+0,15m^2n$
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