$7\left(2+n\right)=28$
$1+5r+10$
$\frac{n}{\frac{n}{m}}$
$x^2-11x+22$
$\lim_{x\to0}\left(\frac{cos\:3x-2cosx}{sen^22x}\right)$
$\sqrt[6]{n^5}-2+1$
$121x^8-100$
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