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-0.8=r/5-1
We move all terms to the left:
-0.8-(r/5-1)=0
We get rid of parentheses
-r/5+1-0.8=0
We multiply all the terms by the denominator
-r+1*5-(0.8)*5=0
We add all the numbers together, and all the variables
-1r+1=0
We move all terms containing r to the left, all other terms to the right
-r=-1
r=-1/-1
r=1
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