$4y+7y^{2}+7x-x+3y+x-4y$
$2^{-1}x\:2^9$
$\left(\frac{1}{2}x+\frac{1}{3}\right)^3$
$3\left(4\right)\left(-9\right)\left(2\right)\left(-2\right)\left(9\right)$
$-8x^2+3-9x^2+3x-3$
$\frac{x^{4}-3x^{3}+2x-8}{x+3}$
$3\left(x+1\right)-3\left(x-2\right)$
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