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