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=0.8R+0.2
We move all terms to the left:
-(0.8R+0.2)=0
We get rid of parentheses
-0.8R-0.2=0
We move all terms containing R to the left, all other terms to the right
-0.8R=0.2
R=0.2/-0.8
R=-0.2/0.8
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