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5r+23=15r+3
We move all terms to the left:
5r+23-(15r+3)=0
We get rid of parentheses
5r-15r-3+23=0
We add all the numbers together, and all the variables
-10r+20=0
We move all terms containing r to the left, all other terms to the right
-10r=-20
r=-20/-10
r=+2
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