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1.6=0.4r
We move all terms to the left:
1.6-(0.4r)=0
We add all the numbers together, and all the variables
-(+0.4r)+1.6=0
We get rid of parentheses
-0.4r+1.6=0
We move all terms containing r to the left, all other terms to the right
-0.4r=-1.6
r=-1.6/-0.4
r=+4
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