$2w-2\left(4z-6w\right)-3z$
$\int\left(cos^3\left(\frac{x}{6}\right)\right)dx$
$4m^2-20m$
$2x\left(x+3\right)-3\left(4x-1\right)+\left(x+1\right)^2$
$2x+5y+7x-y$
$\left(81^2-6s^2\right)+\left(4s^2-21^2+6\right)$
$2x^2+8xy+8y^2-x^2-4xy+4y^2+x^2-4y^2$
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