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r/3-8.58=-7.88
We move all terms to the left:
r/3-8.58-(-7.88)=0
We add all the numbers together, and all the variables
r/3-0.7=0
We multiply all the terms by the denominator
r-(0.7)*3=0
We add all the numbers together, and all the variables
r-2.1=0
We move all terms containing r to the left, all other terms to the right
r=2.1
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