Evaluate `(2^(n)+ 2^(n-1))/(2^(n+1) - 2^(n))`

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Evaluate `(2^(n)+ 2^(n-1))/(2^(n+1) - 2^(n))`
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HOW?? how can 1+1 be 3?!?? And is correct BUT that WON'T work! And I am sorry if I am wrong but I can't understand

emmachang