$\frac{\left(5y^2-6y+7\right)}{5y-1}$
$4x+5\le2$
$5xy'+10y=20\:$
$\lim_{x\to a}\left(\frac{\sqrt[m]{a}-\sqrt[m]{x}}{x-a}\right)$
$\frac{-2x^2+\frac{1}{2}x}{-1+\frac{1}{2}x}$
$2.\left(1+x\right)=3+x$
$\int\frac{\left(2xin\left(x^2+1\right)\right)}{x^2+1}dx$
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