$n^{3}+343$
$-\left(-4+7-9\right)-\left(-2\right)+\left(-3+7\right)$
$\frac{1-2-2-3}{-1}$
$\left(2x+y\right)^7$
$4x^2-2x+3\:for\:x=-2$
$\left(2m^4\right)\left(5m^2\right)$
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