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X+X=2.10
We move all terms to the left:
X+X-(2.10)=0
We add all the numbers together, and all the variables
X+X-(2.1)=0
We add all the numbers together, and all the variables
2X-2.1=0
We move all terms containing X to the left, all other terms to the right
2X=2.1
X=2.1/2
X=1+0.1/2
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