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