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18=r+2.6
We move all terms to the left:
18-(r+2.6)=0
We get rid of parentheses
-r-2.6+18=0
We add all the numbers together, and all the variables
-1r+15.4=0
We move all terms containing r to the left, all other terms to the right
-r=-15.4
r=-15.4/-1
r=15+0.4/1
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