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X+(X+8)-(5.5)=0
We add all the numbers together, and all the variables
X+(X+8)-5.5=0
We get rid of parentheses
X+X+8-5.5=0
We add all the numbers together, and all the variables
2X+2.5=0
We move all terms containing X to the left, all other terms to the right
2X=-2.5
X=-2.5/2
X=-1+0.5/2
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