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64=r^-2
We move all terms to the left:
64-(r^-2)=0
We get rid of parentheses
-r^+2+64=0
We add all the numbers together, and all the variables
-1r+66=0
We move all terms containing r to the left, all other terms to the right
-r=-66
r=-66/-1
r=+66
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