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5.3=r+6.5
We move all terms to the left:
5.3-(r+6.5)=0
We get rid of parentheses
-r-6.5+5.3=0
We add all the numbers together, and all the variables
-1r-1.2=0
We move all terms containing r to the left, all other terms to the right
-r=1.2
r=1.2/-1
r=-1+0.2/1
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