$\left(4r^2+4r+10\right)$
$xy^{-6}\:\left(\:x^6\:y^1-y^{-1}+x^{-6}\:y^{-4}-xy^{-6}\:z+3\right)$
$2.8-0.75$
$y2-10y-25$
$2y^2-7y+5$
$y^2-7xy^2=2x^3y^2+x^2y^2-9y$
$\left(3x^2\right)\left(x^{-2}\right)$
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