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r/7.2+6=5
We move all terms to the left:
r/7.2+6-(5)=0
We add all the numbers together, and all the variables
r/7.2+1=0
We multiply all the terms by the denominator
r+1*7.2=0
We add all the numbers together, and all the variables
r+7.2=0
We move all terms containing r to the left, all other terms to the right
r=-7.2
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