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48=8(r+9)
We move all terms to the left:
48-(8(r+9))=0
We calculate terms in parentheses: -(8(r+9)), so:We get rid of parentheses
8(r+9)
We multiply parentheses
8r+72
Back to the equation:
-(8r+72)
-8r-72+48=0
We add all the numbers together, and all the variables
-8r-24=0
We move all terms containing r to the left, all other terms to the right
-8r=24
r=24/-8
r=-3
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