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If 3^(x-1)+3^(x-2)+3^(x-3)+3^(x-4)+........

If `3^(x-1)+3^(x-2)+3^(x-3)+3^(x-4)+......oo=2(5^(2)+5+1+(1)/(5)+....oo)` then `x=3log_(3)N` .The value of `N` equals

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