9^-3r=81^-r

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Solution for 9^-3r=81^-r equation: 



9^-3r=81^-r

We move all terms to the left:

9^-3r-(81^-r)=0

We add all the numbers together, and all the variables

-3r-(81^-r)=0

We get rid of parentheses

-3r+r-81^=0

We add all the numbers together, and all the variables

-2r=0

r=0/-2

r=0

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