$\left|-20\right|+\left|-9+2\right|$
$3\left(-2\right)+3\left(4\right)$
$\left(54-60x^{20}y^{15}z^4\right)^2$
$2.8w+5.6$
$15s+17s$
$\left(-879\:\right)+\left(-935\right)$
$\left(\frac{2}{5}m^2+\frac{1}{3}mn-\frac{1}{2}n^2\right)\left(\frac{2}{3}m^2+2n^2-mn\right)$
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