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1+r/7=5
We move all terms to the left:
1+r/7-(5)=0
We add all the numbers together, and all the variables
r/7-4=0
We multiply all the terms by the denominator
r-4*7=0
We add all the numbers together, and all the variables
r-28=0
We move all terms containing r to the left, all other terms to the right
r=28
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