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6=r/7-1
We move all terms to the left:
6-(r/7-1)=0
We get rid of parentheses
-r/7+1+6=0
We multiply all the terms by the denominator
-r+1*7+6*7=0
We add all the numbers together, and all the variables
-1r+49=0
We move all terms containing r to the left, all other terms to the right
-r=-49
r=-49/-1
r=+49
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