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-(3x+9)=104
We move all terms to the left:
-(3x+9)-(104)=0
We get rid of parentheses
-3x-9-104=0
We add all the numbers together, and all the variables
-3x-113=0
We move all terms containing x to the left, all other terms to the right
-3x=113
x=113/-3
x=-37+2/3
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