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10=r/3+9
We move all terms to the left:
10-(r/3+9)=0
We get rid of parentheses
-r/3-9+10=0
We multiply all the terms by the denominator
-r-9*3+10*3=0
We add all the numbers together, and all the variables
-1r+3=0
We move all terms containing r to the left, all other terms to the right
-r=-3
r=-3/-1
r=+3
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