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r/4+9.1=12.7
We move all terms to the left:
r/4+9.1-(12.7)=0
We add all the numbers together, and all the variables
r/4-3.6=0
We multiply all the terms by the denominator
r-(3.6)*4=0
We add all the numbers together, and all the variables
r-14.4=0
We move all terms containing r to the left, all other terms to the right
r=14.4
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