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-12-8r=4(6r+1)
We move all terms to the left:
-12-8r-(4(6r+1))=0
We calculate terms in parentheses: -(4(6r+1)), so:We get rid of parentheses
4(6r+1)
We multiply parentheses
24r+4
Back to the equation:
-(24r+4)
-8r-24r-4-12=0
We add all the numbers together, and all the variables
-32r-16=0
We move all terms containing r to the left, all other terms to the right
-32r=16
r=16/-32
r=-1/2
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