$\sqrt{-512}$
$-x+2-y+4x-4+7y$
$6x+1-3x+1$
$3.8+4.7$
$2x+\left\{-5x-\left\{-2y+\left\{-x+y\right\}\right\}+6\right\}$
$\left(x+4\right)\left(x-4\right)^2$
$\int x ^ { - 6 } d x$
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