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1(9.8r-8.1)=76.8
We move all terms to the left:
1(9.8r-8.1)-(76.8)=0
We add all the numbers together, and all the variables
1(9.8r-8.1)-76.8=0
We move all terms containing r to the left, all other terms to the right
1(9.8r-8.1)=76.8
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