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X+3+3+6+X+3+X+3+6=30
We move all terms to the left:
X+3+3+6+X+3+X+3+6-(30)=0
We add all the numbers together, and all the variables
3X-6=0
We move all terms containing X to the left, all other terms to the right
3X=6
X=6/3
X=2
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