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-0.42=0.35r
We move all terms to the left:
-0.42-(0.35r)=0
We add all the numbers together, and all the variables
-(+0.35r)-0.42=0
We get rid of parentheses
-0.35r-0.42=0
We move all terms containing r to the left, all other terms to the right
-0.35r=0.42
r=0.42/-0.35
r=-1+0.07/0.35
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