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4(2r+4)=16+8r
We move all terms to the left:
4(2r+4)-(16+8r)=0
We add all the numbers together, and all the variables
4(2r+4)-(8r+16)=0
We multiply parentheses
8r-(8r+16)+16=0
We get rid of parentheses
8r-8r-16+16=0
We add all the numbers together, and all the variables
=0
r=0/1
r=0
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