Root 7 -1/root 7+1=a+d root 7
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(√7 -1)/(√7 +1)=
(√7-1)(√7-1)/(√7+1)(√7-1)=
(7+1-2√7)/(7-1)
(8-2√7)/6
=> 4/3 -√7/3=(4/3)+(-1/3).√7
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