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4.2=r+5.2
We move all terms to the left:
4.2-(r+5.2)=0
We get rid of parentheses
-r-5.2+4.2=0
We add all the numbers together, and all the variables
-1r-1=0
We move all terms containing r to the left, all other terms to the right
-r=1
r=1/-1
r=-1
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