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7.2=-14.1+r
We move all terms to the left:
7.2-(-14.1+r)=0
We add all the numbers together, and all the variables
-(r-14.1)+7.2=0
We get rid of parentheses
-r+14.1+7.2=0
We add all the numbers together, and all the variables
-1r+21.3=0
We move all terms containing r to the left, all other terms to the right
-r=-21.3
r=-21.3/-1
r=21+0.3/1
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