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3=6+r
We move all terms to the left:
3-(6+r)=0
We add all the numbers together, and all the variables
-(r+6)+3=0
We get rid of parentheses
-r-6+3=0
We add all the numbers together, and all the variables
-1r-3=0
We move all terms containing r to the left, all other terms to the right
-r=3
r=3/-1
r=-3
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