$-\left(2m+4\right)^2$
$\frac{x^5-x^4-2}{x^2+1}$
$\frac{2a^2-a-15}{2a+5}$
$\frac{20x^7}{10x^5}$
$12,5+3,78$
$\frac{9}{x^2+5}\:=\:\frac{5}{x^2+1}$
$\frac{dy}{dx}=-y^2+y$
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