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1=r/89
We move all terms to the left:
1-(r/89)=0
We add all the numbers together, and all the variables
-(+r/89)+1=0
We get rid of parentheses
-r/89+1=0
We multiply all the terms by the denominator
-r+1*89=0
We add all the numbers together, and all the variables
-1r+89=0
We move all terms containing r to the left, all other terms to the right
-r=-89
r=-89/-1
r=+89
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