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Why are $\frac{1}{f}=\frac{1}{g}+\frac{1}{b}$ and $f=g+b$ not the same thing?

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    $\begingroup$ Try $1/2 + 1/2$. Now try $2 + 2$. $\endgroup$ – aes Nov 22 '14 at 20:24
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we have $\frac{1}{f}=\frac{g+b}{bg}$ and then we have $f=\frac{bg}{b+g}$

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  • $\begingroup$ Stared too long at it =) , sorry for the question. $\endgroup$ – user42141 Nov 22 '14 at 20:24

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