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2√20 - 3√7 - 2√5 + 4√63

= 2√(4 x 5) - 3√7 - 2√5 + 4√(9 x 7)

= 4√5 - 2√5 - 3√7 + 12√7

= 2√5 + 9√7

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16y ago

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