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Which of the following equation (s) has ...

Which of the following equation (s) has (have) only unity as the solution.
(A) `2(3^(x+1))-6(3^(x-1))-3^(x)=9`
(B) `7(3^(x+1))-5^(x+2)=3^(x+4)-5^(x+4)`

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The correct Answer is:
A
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