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X+(2X+4)=25
We move all terms to the left:
X+(2X+4)-(25)=0
We get rid of parentheses
X+2X+4-25=0
We add all the numbers together, and all the variables
3X-21=0
We move all terms containing X to the left, all other terms to the right
3X=21
X=21/3
X=7
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