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X+(3X+3)=25
We move all terms to the left:
X+(3X+3)-(25)=0
We get rid of parentheses
X+3X+3-25=0
We add all the numbers together, and all the variables
4X-22=0
We move all terms containing X to the left, all other terms to the right
4X=22
X=22/4
X=5+1/2
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