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10=9+r/15
We move all terms to the left:
10-(9+r/15)=0
We add all the numbers together, and all the variables
-(r/15+9)+10=0
We get rid of parentheses
-r/15-9+10=0
We multiply all the terms by the denominator
-r-9*15+10*15=0
We add all the numbers together, and all the variables
-1r+15=0
We move all terms containing r to the left, all other terms to the right
-r=-15
r=-15/-1
r=+15
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