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=200-7.5R
We move all terms to the left:
-(200-7.5R)=0
We add all the numbers together, and all the variables
-(-7.5R+200)=0
We get rid of parentheses
7.5R-200=0
We move all terms containing R to the left, all other terms to the right
7.5R=200
R=200/7.5
R=26+5/7.5
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