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X+X=80.000
We move all terms to the left:
X+X-(80.000)=0
We add all the numbers together, and all the variables
X+X-80=0
We add all the numbers together, and all the variables
2X-80=0
We move all terms containing X to the left, all other terms to the right
2X=80
X=80/2
X=40
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