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r/10+80=88
We move all terms to the left:
r/10+80-(88)=0
We add all the numbers together, and all the variables
r/10-8=0
We multiply all the terms by the denominator
r-8*10=0
We add all the numbers together, and all the variables
r-80=0
We move all terms containing r to the left, all other terms to the right
r=80
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