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5+r/7=13
We move all terms to the left:
5+r/7-(13)=0
We add all the numbers together, and all the variables
r/7-8=0
We multiply all the terms by the denominator
r-8*7=0
We add all the numbers together, and all the variables
r-56=0
We move all terms containing r to the left, all other terms to the right
r=56
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