$\:\frac{x-2}{x^3-8}$
$3\sqrt[7]{x^2}$
$7a^x-30a^x-41a^x-9a^x$
$\lim_{x\to0}\left(\frac{\left(b+x\right)^2-b^2}{x}\right)$
$+3+4+2+6$
$f\left(x\right)=\frac{6x+6}{x+2}$
$m^2-n^2=\left(m+n\right)\left(m-n\right)$
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