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r/10+6=13
We move all terms to the left:
r/10+6-(13)=0
We add all the numbers together, and all the variables
r/10-7=0
We multiply all the terms by the denominator
r-7*10=0
We add all the numbers together, and all the variables
r-70=0
We move all terms containing r to the left, all other terms to the right
r=70
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