$9z^4-100z^5$
$140\:-\:\left(-370\right)$
$\int x^33^{3x}dx$
$-4.7y-2.3y$
$2\cdot3\cdot\left(9+5\right)$
$\frac{\left(6\right)^3+\left(xy^2\right)^3}{6+xy^2}$
$4-5-2x-4y+4-5x+7y$
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