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204=3(4+8r)
We move all terms to the left:
204-(3(4+8r))=0
We add all the numbers together, and all the variables
-(3(8r+4))+204=0
We calculate terms in parentheses: -(3(8r+4)), so:We get rid of parentheses
3(8r+4)
We multiply parentheses
24r+12
Back to the equation:
-(24r+12)
-24r-12+204=0
We add all the numbers together, and all the variables
-24r+192=0
We move all terms containing r to the left, all other terms to the right
-24r=-192
r=-192/-24
r=+8
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