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1(6.5r-6.6)=63.1
We move all terms to the left:
1(6.5r-6.6)-(63.1)=0
We add all the numbers together, and all the variables
1(6.5r-6.6)-63.1=0
We move all terms containing r to the left, all other terms to the right
1(6.5r-6.6)=63.1
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