3^x+2(3^x)=81

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Solution for 3^x+2(3^x)=81 equation: 



3^x+2(3^x)=81

We move all terms to the left:

3^x+2(3^x)-(81)=0

We move all terms containing x to the left, all other terms to the right

3^x+23^x=81

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