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12-(3r-23)+8r=5r+35
We move all terms to the left:
12-(3r-23)+8r-(5r+35)=0
We add all the numbers together, and all the variables
8r-(3r-23)-(5r+35)+12=0
We get rid of parentheses
8r-3r-5r+23-35+12=0
We add all the numbers together, and all the variables
=0
r=0/1
r=0
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