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If (3x-1)^(7)=a(7)x^(7)+a(6)x^(6)+a(5)x^...

If `(3x-1)^(7)=a_(7)x^(7)+a_(6)x^(6)+a_(5)x^(5)+.......+a_(1)x+a_(0)`, then find the value of `a_(7)+a_(6)+a_(5)+...........+a_(0)`.

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