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11=r+4+4r
We move all terms to the left:
11-(r+4+4r)=0
We add all the numbers together, and all the variables
-(5r+4)+11=0
We get rid of parentheses
-5r-4+11=0
We add all the numbers together, and all the variables
-5r+7=0
We move all terms containing r to the left, all other terms to the right
-5r=-7
r=-7/-5
r=1+2/5
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