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12=6.1+r
We move all terms to the left:
12-(6.1+r)=0
We add all the numbers together, and all the variables
-(r+6.1)+12=0
We get rid of parentheses
-r-6.1+12=0
We add all the numbers together, and all the variables
-1r+5.9=0
We move all terms containing r to the left, all other terms to the right
-r=-5.9
r=-5.9/-1
r=5+0.9/1
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