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3(7-2(7x-4))=-42x+45
We move all terms to the left:
3(7-2(7x-4))-(-42x+45)=0
We get rid of parentheses
3(7-2(7x-4))+42x-45=0
We add all the numbers together, and all the variables
42x+3(7-2(7x-4))-45=0
We move all terms containing x to the left, all other terms to the right
42x+3(7-2(7x-4))=45
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