$2m+2m-m$
$\left(4x+2\right)\left(5x+1\right)$
$2x^4\cdot2x^4$
$\left(a^2b-3g^3\right)^2$
$\left(4m+2n\right)\left(4m+2\right)$
$7x-9y-6x+2y$
$\left(\frac{2}{3}a^2+2\right)\left(\frac{2}{3}a^2+3\right)$
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