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9=r/10-1
We move all terms to the left:
9-(r/10-1)=0
We get rid of parentheses
-r/10+1+9=0
We multiply all the terms by the denominator
-r+1*10+9*10=0
We add all the numbers together, and all the variables
-1r+100=0
We move all terms containing r to the left, all other terms to the right
-r=-100
r=-100/-1
r=+100
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