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6r=3(4+r)
We move all terms to the left:
6r-(3(4+r))=0
We add all the numbers together, and all the variables
6r-(3(r+4))=0
We calculate terms in parentheses: -(3(r+4)), so:We get rid of parentheses
3(r+4)
We multiply parentheses
3r+12
Back to the equation:
-(3r+12)
6r-3r-12=0
We add all the numbers together, and all the variables
3r-12=0
We move all terms containing r to the left, all other terms to the right
3r=12
r=12/3
r=4
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