$5x-6\ge3x+4$
$a^3-6ab^2+9a-15a^2b-8a+5$
$m+9+9m+3+9m$
$\:\left(2.7x+7.9y\right)+\left(1.6x+5.5y\right)\:$
$\frac{1}{4-3x-x^2}$
$\left(x+y\right)\left(x^2+xy+y^2\right)$
$\left(x^3-5x+3\right)+\left(6x^3+2x-5\right)$
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