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(60+20)x=400+20x
We move all terms to the left:
(60+20)x-(400+20x)=0
We add all the numbers together, and all the variables
80x-(20x+400)=0
We get rid of parentheses
80x-20x-400=0
We add all the numbers together, and all the variables
60x-400=0
We move all terms containing x to the left, all other terms to the right
60x=400
x=400/60
x=6+2/3
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