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X+X+2=189.5.
We move all terms to the left:
X+X+2-(189.5.)=0
We add all the numbers together, and all the variables
X+X+2-0=0
We add all the numbers together, and all the variables
2X+2=0
We move all terms containing X to the left, all other terms to the right
2X=-2
X=-2/2
X=-1
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