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=42-0.7R
We move all terms to the left:
-(42-0.7R)=0
We add all the numbers together, and all the variables
-(-0.7R+42)=0
We get rid of parentheses
0.7R-42=0
We move all terms containing R to the left, all other terms to the right
0.7R=42
R=42/0.7
R=60
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