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6.2=2.2+r=
We move all terms to the left:
6.2-(2.2+r)=0
We add all the numbers together, and all the variables
-(r+2.2)+6.2=0
We get rid of parentheses
-r-2.2+6.2=0
We add all the numbers together, and all the variables
-1r+4=0
We move all terms containing r to the left, all other terms to the right
-r=-4
r=-4/-1
r=+4
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