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3x+200=x+600
We move all terms to the left:
3x+200-(x+600)=0
We get rid of parentheses
3x-x-600+200=0
We add all the numbers together, and all the variables
2x-400=0
We move all terms containing x to the left, all other terms to the right
2x=400
x=400/2
x=200
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