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6=-6+r
We move all terms to the left:
6-(-6+r)=0
We add all the numbers together, and all the variables
-(r-6)+6=0
We get rid of parentheses
-r+6+6=0
We add all the numbers together, and all the variables
-1r+12=0
We move all terms containing r to the left, all other terms to the right
-r=-12
r=-12/-1
r=+12
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