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-(x+13)-3x=11
We move all terms to the left:
-(x+13)-3x-(11)=0
We add all the numbers together, and all the variables
-3x-(x+13)-11=0
We get rid of parentheses
-3x-x-13-11=0
We add all the numbers together, and all the variables
-4x-24=0
We move all terms containing x to the left, all other terms to the right
-4x=24
x=24/-4
x=-6
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