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5(7x-4)=400
We move all terms to the left:
5(7x-4)-(400)=0
We multiply parentheses
35x-20-400=0
We add all the numbers together, and all the variables
35x-420=0
We move all terms containing x to the left, all other terms to the right
35x=420
x=420/35
x=12
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