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