$11-\left[7-4\left(2\right)-\left(1+2\right)\right]$
$\left(9a^3b-13a^2\right)^2$
$a^3a^8a^{-5}$
$7x\:+2y+5\:-5x+5+9y-1$
$15+20y-40$
$\int x^{\frac{1}{3}}\left(x-7\right)^2dx$
$x-1<=3$
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