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