$25x^2y^2+5x+4x$
$x^2+35x+36$
$\int\frac{2x^2-x+4}{\left(x^3-4x\right)}dx$
$\lim_{x\to4}\left(\frac{5x^2+10x}{x^2-6x-16}\right)$
$-17+\sqrt{2.6}$
$x+13=30$
$a+\frac{1}{3}=\frac{1}{a+3}$
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