$5x=10$
$\sin=\frac{4\sqrt{13}}{17}$
$\left(x-2\right)+\left(3x+8\right)$
$\left(x^2+2x-1\right)\left(x^2-2x-1\right)$
$5x+1;\:x=3$
$4n^42n^{-3}$
$\lim_{x\to4}\left(\frac{\sqrt{11+x}-3}{x+2}\right)$
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