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16=2r-2+4r
We move all terms to the left:
16-(2r-2+4r)=0
We add all the numbers together, and all the variables
-(6r-2)+16=0
We get rid of parentheses
-6r+2+16=0
We add all the numbers together, and all the variables
-6r+18=0
We move all terms containing r to the left, all other terms to the right
-6r=-18
r=-18/-6
r=+3
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