$8a+4b+4b+2a$
$\left(x+50\right)^2$
$\frac{2a^5b^9}{8a^5b}$
$z^2-81u^6$
$x^2-17+72$
$\lim_{x\to+\infty}\left(\frac{-4x^2-x}{4x-3-2x^2}\right)$
$3\frac{dy}{dx}=4y$
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