$\left(x+\frac{2}{5}\right)\left(\frac{1}{2}x+\frac{1}{6}\right)$
$-5.\left|x+3\right|<4.x-5$
$-2\left(z-4\right)$
$m^2+23m+126$
$\frac{20a^5b^4k}{5a^2bk}$
$\left(5x-2x^3-4x^2-2\right)+\left(x^4+2x^3-x^5+5\right)$
$4x^6-9a^8$
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