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X+(X+1)+(X+3)=-39
We move all terms to the left:
X+(X+1)+(X+3)-(-39)=0
We add all the numbers together, and all the variables
X+(X+1)+(X+3)+39=0
We get rid of parentheses
X+X+X+1+3+39=0
We add all the numbers together, and all the variables
3X+43=0
We move all terms containing X to the left, all other terms to the right
3X=-43
X=-43/3
X=-14+1/3
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