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1.9=r.3
We move all terms to the left:
1.9-(r.3)=0
We add all the numbers together, and all the variables
-(+r.3)+1.9=0
We get rid of parentheses
-r.3+1.9=0
We move all terms containing r to the left, all other terms to the right
-r.3=-1.9
r=-1.9/1
r=-1.9
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