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= (3 x 2) x (√7 x √21 x √27)
= 6 x √3969
= 6 x 63
= 378
= 6√147 - √27
= 6 √3 x √49 - √9 x √3
= 6 √3 x 7 - 3√3
= 42 √3 - 3√3
= (42-3) √3
= 39 √3