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18=2r+4
We move all terms to the left:
18-(2r+4)=0
We get rid of parentheses
-2r-4+18=0
We add all the numbers together, and all the variables
-2r+14=0
We move all terms containing r to the left, all other terms to the right
-2r=-14
r=-14/-2
r=+7
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