$-40\:\:50\:+\:-30$
$\left(3m^3-8\right)\left(3m^3-8\right)$
$\sqrt[9]{27\cdot a^{18}\cdot b^6}$
$\sqrt{7x}$
$\left(2b+4a+3c+11\right)+\left(12a-18b-15c\right)$
$\frac{3}{7}\left(\left(0.4\right)\right)-1$
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