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-16=r-11+3
We move all terms to the left:
-16-(r-11+3)=0
We add all the numbers together, and all the variables
-(r-8)-16=0
We get rid of parentheses
-r+8-16=0
We add all the numbers together, and all the variables
-1r-8=0
We move all terms containing r to the left, all other terms to the right
-r=8
r=8/-1
r=-8
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