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X+2X(-4)=8
We move all terms to the left:
X+2X(-4)-(8)=0
We multiply parentheses
X-8X-8=0
We add all the numbers together, and all the variables
-7X-8=0
We move all terms containing X to the left, all other terms to the right
-7X=8
X=8/-7
X=-1+1/7
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