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