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2-4√7 / √5 + 2
⇒( 2-4√7 ) ( √5 - 2 )
(√5 + 2 ) ( √5 - 2 )
⇒ 2√5 - 4 - 4√35 + 8√7
5 - 4
⇒ 2√5 - 4 - 4√35 + 8√7