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(2x-200)+x+(2x-400)=2400
We move all terms to the left:
(2x-200)+x+(2x-400)-(2400)=0
We add all the numbers together, and all the variables
x+(2x-200)+(2x-400)-2400=0
We get rid of parentheses
x+2x+2x-200-400-2400=0
We add all the numbers together, and all the variables
5x-3000=0
We move all terms containing x to the left, all other terms to the right
5x=3000
x=3000/5
x=600
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