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=0.5+0.7R
We move all terms to the left:
-(0.5+0.7R)=0
We add all the numbers together, and all the variables
-(0.7R+0.5)=0
We get rid of parentheses
-0.7R-0.5=0
We move all terms containing R to the left, all other terms to the right
-0.7R=0.5
R=0.5/-0.7
R=-0.5/0.7
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