$-7\left(-10+8\right)$
$x\left(x+5\right)=14$
$\left(x+m\right)^2-\left(x+n\right)^2=\left(m-n\right)^2$
$\frac{2\sqrt{3}}{2}$
$\lim_{x\to-2}\left(\frac{3x^2-x-16}{2x+4}\right)$
$\int\frac{2}{9x^2+1}dx$
$\left(n^2-n-1\right)\left(n^2+n-1\right)$
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