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X+2X=1.30
We move all terms to the left:
X+2X-(1.30)=0
We add all the numbers together, and all the variables
X+2X-(1.3)=0
We add all the numbers together, and all the variables
3X-1.3=0
We move all terms containing X to the left, all other terms to the right
3X=1.3
X=1.3/3
X=1/2.30769230769
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