$-9u+4u$
$\frac{8}{-2}$
$4m^2\sqrt{12bc^2}$
$\left(2x+3\right)\left(2x^2-4\right)$
$\left(4a-7\right)^5$
$\frac{2x^3}{-7x^2}$
$216\cdot23$
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