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r-2.6=3.5r=
We move all terms to the left:
r-2.6-(3.5r)=0
We add all the numbers together, and all the variables
r-(+3.5r)-2.6=0
We get rid of parentheses
r-3.5r-2.6=0
We add all the numbers together, and all the variables
-2.5r-2.6=0
We move all terms containing r to the left, all other terms to the right
-2.5r=2.6
r=2.6/-2.5
r=-1+0.1/2.5
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