$4y-4y+y$
$\left(2x^2+9\right)\left(4x^4-18x^2+81\right)$
$67x^5y^3z+98x^5y^3z$
$-12u+7+12u$
$\frac{d^2}{dx^2}=2^{xy}$
$\left(y-2z\right)^3$
$\left(3x^2-3y^2\right)^3$
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