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x+(2x-4)=100
We move all terms to the left:
x+(2x-4)-(100)=0
We get rid of parentheses
x+2x-4-100=0
We add all the numbers together, and all the variables
3x-104=0
We move all terms containing x to the left, all other terms to the right
3x=104
x=104/3
x=34+2/3
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