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X+2X+(2X+4)=39
We move all terms to the left:
X+2X+(2X+4)-(39)=0
We add all the numbers together, and all the variables
3X+(2X+4)-39=0
We get rid of parentheses
3X+2X+4-39=0
We add all the numbers together, and all the variables
5X-35=0
We move all terms containing X to the left, all other terms to the right
5X=35
X=35/5
X=7
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