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-2(X+X)=6
We move all terms to the left:
-2(X+X)-(6)=0
We add all the numbers together, and all the variables
-2(+2X)-6=0
We multiply parentheses
-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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