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64.1r=13.2
We move all terms to the left:
64.1r-(13.2)=0
We add all the numbers together, and all the variables
64.1r-13.2=0
We move all terms containing r to the left, all other terms to the right
64.1r=13.2
r=13.2/64.1
r=11/53.4166666667
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