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X+(X+3)=-17
We move all terms to the left:
X+(X+3)-(-17)=0
We add all the numbers together, and all the variables
X+(X+3)+17=0
We get rid of parentheses
X+X+3+17=0
We add all the numbers together, and all the variables
2X+20=0
We move all terms containing X to the left, all other terms to the right
2X=-20
X=-20/2
X=-10
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