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= 21 / (2√3 + √5) x (2√3 - √5) / (2√3 - √5)
= 42√3 - 21 √5 / (12 - 5)
= 42√3 - 21 √5 / 7
= 42√3 - 21 √5 / 7
= 7(6√3 - 3√5) / 7
= 6√3 - 3√5
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