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X+3+X+6+X+9=18X
We move all terms to the left:
X+3+X+6+X+9-(18X)=0
We add all the numbers together, and all the variables
-15X+18=0
We move all terms containing X to the left, all other terms to the right
-15X=-18
X=-18/-15
X=1+1/5
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