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4(20x+50)=680
We move all terms to the left:
4(20x+50)-(680)=0
We multiply parentheses
80x+200-680=0
We add all the numbers together, and all the variables
80x-480=0
We move all terms containing x to the left, all other terms to the right
80x=480
x=480/80
x=6
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