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-6.2=0.4r
We move all terms to the left:
-6.2-(0.4r)=0
We add all the numbers together, and all the variables
-(+0.4r)-6.2=0
We get rid of parentheses
-0.4r-6.2=0
We move all terms containing r to the left, all other terms to the right
-0.4r=6.2
r=6.2/-0.4
r=-15+0.2/0.4
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