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= 5/(2 + √7) × (2 - √7)/(2 - √7)
= 5(2 - √7)/(2 + √7)(2 - √7)
= (10 - 5√7)/(4 - 7)
= (10 - 5√7)/-3
= -(10 - 5√7)/3
= (5√7 - 10)/3
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