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X+9+2X=3X+1+X+X
We move all terms to the left:
X+9+2X-(3X+1+X+X)=0
We add all the numbers together, and all the variables
X+2X-(5X+1)+9=0
We add all the numbers together, and all the variables
3X-(5X+1)+9=0
We get rid of parentheses
3X-5X-1+9=0
We add all the numbers together, and all the variables
-2X+8=0
We move all terms containing X to the left, all other terms to the right
-2X=-8
X=-8/-2
X=+4
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