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= 3√5 + 7√5 - 2√5 - 9√5
= 10√5 -11√5
= -√5
= √(9 x 5) + √(49 x 5) - √(4 x 5) - √(81 x 5)
= 3√5 + 7√5 - 2√5 - 9√5
= - √5