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-3.88=r-9.76
We move all terms to the left:
-3.88-(r-9.76)=0
We get rid of parentheses
-r+9.76-3.88=0
We add all the numbers together, and all the variables
-1r+5.88=0
We move all terms containing r to the left, all other terms to the right
-r=-5.88
r=-5.88/-1
r=5+0.88/1
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