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250x+550(x-1)+350(3((x-1)-1))=5450
We move all terms to the left:
250x+550(x-1)+350(3((x-1)-1))-(5450)=0
We multiply parentheses
250x+550x+350(3((x-1)-1))-550-5450=0
We add all the numbers together, and all the variables
800x+350(3((x-1)-1))-6000=0
We move all terms containing x to the left, all other terms to the right
800x+350(3((x-1)-1))=6000
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