(16 x 2n+1 - 4 x 2n) / (16 x 2n+2 - 2 x 2n+2) = ?
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4n+16+1-4/4n+16+2-2-2
4n+13/4n+14
4n+13=4n+14
4n-4n=13-14
n=1
4n+13/4n+14
4n+13=4n+14
4n-4n=13-14
n=1
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