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X=-3X-6
We move all terms to the left:
X-(-3X-6)=0
We get rid of parentheses
X+3X+6=0
We add all the numbers together, and all the variables
4X+6=0
We move all terms containing X to the left, all other terms to the right
4X=-6
X=-6/4
X=-1+1/2
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