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23=3+5r
We move all terms to the left:
23-(3+5r)=0
We add all the numbers together, and all the variables
-(5r+3)+23=0
We get rid of parentheses
-5r-3+23=0
We add all the numbers together, and all the variables
-5r+20=0
We move all terms containing r to the left, all other terms to the right
-5r=-20
r=-20/-5
r=+4
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