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X+X=30.000
We move all terms to the left:
X+X-(30.000)=0
We add all the numbers together, and all the variables
X+X-30=0
We add all the numbers together, and all the variables
2X-30=0
We move all terms containing X to the left, all other terms to the right
2X=30
X=30/2
X=15
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