81=9*3^x

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Solution for 81=9*3^x equation: 



81=9*3^x

We move all terms to the left:

81-(9*3^x)=0

We get rid of parentheses

-9*3^x+81=0

Wy multiply elements

-27x+81=0

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

-27x=-81

x=-81/-27

x=+3

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