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84=-6(2-4r)
We move all terms to the left:
84-(-6(2-4r))=0
We add all the numbers together, and all the variables
-(-6(-4r+2))+84=0
We calculate terms in parentheses: -(-6(-4r+2)), so:We get rid of parentheses
-6(-4r+2)
We multiply parentheses
24r-12
Back to the equation:
-(24r-12)
-24r+12+84=0
We add all the numbers together, and all the variables
-24r+96=0
We move all terms containing r to the left, all other terms to the right
-24r=-96
r=-96/-24
r=+4
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