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Verified answer
7√32 - 3√20 + 4√72= 7√16√2 - 3√4√5 + 4√36√2
= 7.4√2 - 3.2√5 + 4.6√2
= 28√2 - 6√5 + 24√2
= ( 28 + 24 )√2 - 6√5
= 52√2 - 6√5
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