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X+(2X-2)+(4X-4)=30
We move all terms to the left:
X+(2X-2)+(4X-4)-(30)=0
We get rid of parentheses
X+2X+4X-2-4-30=0
We add all the numbers together, and all the variables
7X-36=0
We move all terms containing X to the left, all other terms to the right
7X=36
X=36/7
X=5+1/7
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