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13=4+r
We move all terms to the left:
13-(4+r)=0
We add all the numbers together, and all the variables
-(r+4)+13=0
We get rid of parentheses
-r-4+13=0
We add all the numbers together, and all the variables
-1r+9=0
We move all terms containing r to the left, all other terms to the right
-r=-9
r=-9/-1
r=+9
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