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528=x+(2x)+(4x)
We move all terms to the left:
528-(x+(2x)+(4x))=0
We add all the numbers together, and all the variables
-(+7x)+528=0
We get rid of parentheses
-7x+528=0
We move all terms containing x to the left, all other terms to the right
-7x=-528
x=-528/-7
x=75+3/7
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