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11=-8+r
We move all terms to the left:
11-(-8+r)=0
We add all the numbers together, and all the variables
-(r-8)+11=0
We get rid of parentheses
-r+8+11=0
We add all the numbers together, and all the variables
-1r+19=0
We move all terms containing r to the left, all other terms to the right
-r=-19
r=-19/-1
r=+19
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