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-(r+-23)=3
We move all terms to the left:
-(r+-23)-(3)=0
We add all the numbers together, and all the variables
-(r-23)-3=0
We get rid of parentheses
-r+23-3=0
We add all the numbers together, and all the variables
-1r+20=0
We move all terms containing r to the left, all other terms to the right
-r=-20
r=-20/-1
r=+20
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