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X=X+2X+3X+4X
We move all terms to the left:
X-(X+2X+3X+4X)=0
We add all the numbers together, and all the variables
X-(+10X)=0
We get rid of parentheses
X-10X=0
We add all the numbers together, and all the variables
-9X=0
X=0/-9
X=0
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