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-4(4r-6)=104
We move all terms to the left:
-4(4r-6)-(104)=0
We multiply parentheses
-16r+24-104=0
We add all the numbers together, and all the variables
-16r-80=0
We move all terms containing r to the left, all other terms to the right
-16r=80
r=80/-16
r=-5
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