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= 6 - 3√3 - 2√3 + 3 - √81
= 6 - 5√3 + 3 - 9
= 6 - 5√3 + 3 - 9
= 6 + 3 - 9 - 5√3
= 0 - 5√3
= -5√3
= 0 - 5