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-168+6r=18r-39(r+12)
We move all terms to the left:
-168+6r-(18r-39(r+12))=0
We calculate terms in parentheses: -(18r-39(r+12)), so:We get rid of parentheses
18r-39(r+12)
We multiply parentheses
18r-39r-468
We add all the numbers together, and all the variables
-21r-468
Back to the equation:
-(-21r-468)
6r+21r+468-168=0
We add all the numbers together, and all the variables
27r+300=0
We move all terms containing r to the left, all other terms to the right
27r=-300
r=-300/27
r=-11+1/9
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