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X+(X+1)+(X+2)+(X+3)=13
We move all terms to the left:
X+(X+1)+(X+2)+(X+3)-(13)=0
We get rid of parentheses
X+X+X+X+1+2+3-13=0
We add all the numbers together, and all the variables
4X-7=0
We move all terms containing X to the left, all other terms to the right
4X=7
X=7/4
X=1+3/4
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