find the value of x
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2(3^x - 3^x-1) =324
3^x -3^x-1 =162
3^x - 3^x/3= 162
3^x(1-1/3)=162
3^x×2/3 =162
3^x=162×3/2
3^x=243
3^x=3^5
x=5
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