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-6r-4(6+r)=-84
We move all terms to the left:
-6r-4(6+r)-(-84)=0
We add all the numbers together, and all the variables
-6r-4(r+6)-(-84)=0
We add all the numbers together, and all the variables
-6r-4(r+6)+84=0
We multiply parentheses
-6r-4r-24+84=0
We add all the numbers together, and all the variables
-10r+60=0
We move all terms containing r to the left, all other terms to the right
-10r=-60
r=-60/-10
r=+6
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