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14*sqrt(20) - 3*sqrt(125) = 14*sqrt(4*5) - 3*sqrt(25*5)

= 14*sqrt(4)*sqrt(5) - 3*sqrt(25)*sqrt(5)

= 14*2*sqrt(5) - 3*5*sqrt(5)

= 28*sqrt(5) - 15*sqrt(5) = 13*sqrt(5)

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13y ago

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