$-312\:+\:\left(-241\right)\:-\:115\:+\:\left(+116\right)$
$\left(\frac{x+y+z}{9}\right)^3$
$3^2x\:3^{10}$
$\left(9x^6y^2+4m\right)^3$
$6x^2+7x-20$
$\left(3x-2y+3z\right)^3$
$\left(5x^6-x^2+5x\right)+\left(-3x^6-5x^2\right)$
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