If a + b + c = 27, then what is the value of (a – 7)3 + (b – 9)3 + (c – 11)3 – 3(a – 7)(b – 9)(c

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If a + b + c = 27, then what is the value of (a – 7)³ + (b – 9)³ + (c – 11)³ – 3(a – 7)(b – 9)(c – 11)?

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If $x=\dfrac{2\sqrt{15}}{\sqrt{3}+\sqrt{5}}$,then what is the value of $ \dfrac{x+\sqrt{5}}{x-\sqrt{5}}+\dfrac{x+\sqrt{3}}{x-\sqrt{3}}$ ?

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