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2*sqrt(18) - 4*sqrt(2) = 2*sqrt(9*2) - 4*sqrt(2)

= 2*sqrt(9)*sqrt(2) - 4*sqrt(2)

= 2*3*sqrt(2) - 4*sqrt(2)

= 6*sqrt(2) - 4*sqrt(2)

= 2*sqrt(2)

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