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9^-2r-1=27^-2r
We move all terms to the left:
9^-2r-1-(27^-2r)=0
We add all the numbers together, and all the variables
-2r-(27^-2r)=0
We get rid of parentheses
-2r+2r-27^=0
We add all the numbers together, and all the variables
=0
r=0/1
r=0
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