$3xy+xy$
$\left(5\sqrt{x}+6\right)\left(x^2\right)$
$r^2-20r+2$
$\frac{9n^{-3}}{-10n^{-9}}$
$2a-3b-a+2b$
$x^4-\left(y-1\right)^4$
$1-x^{12}$
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