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X+2X-3X+4X=0.4
We move all terms to the left:
X+2X-3X+4X-(0.4)=0
We add all the numbers together, and all the variables
4X-0.4=0
We move all terms containing X to the left, all other terms to the right
4X=0.4
X=0.4/4
X=0.4/4
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