$9 x + 2 - 5 x + 6$
$y=\frac{8}{3}x+\sqrt{3}+\frac{\sqrt{3}}{3}-\frac{8\pi\:}{9}$
$5b\cdot\left(-3b\right)$
$27a^2-18a+3$
$4b^2-16c^4\:$
$5y^2-45$
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