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X+(3X+13)=105
We move all terms to the left:
X+(3X+13)-(105)=0
We get rid of parentheses
X+3X+13-105=0
We add all the numbers together, and all the variables
4X-92=0
We move all terms containing X to the left, all other terms to the right
4X=92
X=92/4
X=23
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