$\left(6k+8m\right)^2$
$5+-g+-4g+-7g$
$2a-6-ab^2+3b^2$
$9x^2y^2-27x^3y^3-9x^5y^3$
$\frac{dy}{dx}=\frac{2x}{x^2+1}+1$
$3x-4\le x+8$
$\:2\left(3r+4\right)+3\left(r+5\right)$
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