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x+(x+4)+(x+8)=39
We move all terms to the left:
x+(x+4)+(x+8)-(39)=0
We get rid of parentheses
x+x+x+4+8-39=0
We add all the numbers together, and all the variables
3x-27=0
We move all terms containing x to the left, all other terms to the right
3x=27
x=27/3
x=9
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