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4(2r+7)=2(4+6r)
We move all terms to the left:
4(2r+7)-(2(4+6r))=0
We add all the numbers together, and all the variables
4(2r+7)-(2(6r+4))=0
We multiply parentheses
8r-(2(6r+4))+28=0
We calculate terms in parentheses: -(2(6r+4)), so:We get rid of parentheses
2(6r+4)
We multiply parentheses
12r+8
Back to the equation:
-(12r+8)
8r-12r-8+28=0
We add all the numbers together, and all the variables
-4r+20=0
We move all terms containing r to the left, all other terms to the right
-4r=-20
r=-20/-4
r=+5
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