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r/1.2=-6
We move all terms to the left:
r/1.2-(-6)=0
We add all the numbers together, and all the variables
r/1.2+6=0
We multiply all the terms by the denominator
r+6*1.2=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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