$\left(3xy\right)^{-1}$
$15r+10$
$\left(3x^3y^2-5x^2\right)^3$
$\left(5a^2b+5a^2b+7b\right)+\left(2a^2b-3ab^2+4b\right)$
$\left(7b^4\right)^5$
$\frac{4}{25}x^2-64$
$5mx+2=3m+x$
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