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6x=(2x+200)+400
We move all terms to the left:
6x-((2x+200)+400)=0
We calculate terms in parentheses: -((2x+200)+400), so:We get rid of parentheses
(2x+200)+400
We get rid of parentheses
2x+200+400
We add all the numbers together, and all the variables
2x+600
Back to the equation:
-(2x+600)
6x-2x-600=0
We add all the numbers together, and all the variables
4x-600=0
We move all terms containing x to the left, all other terms to the right
4x=600
x=600/4
x=150
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