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9=r/9+5
We move all terms to the left:
9-(r/9+5)=0
We get rid of parentheses
-r/9-5+9=0
We multiply all the terms by the denominator
-r-5*9+9*9=0
We add all the numbers together, and all the variables
-1r+36=0
We move all terms containing r to the left, all other terms to the right
-r=-36
r=-36/-1
r=+36
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