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x*2=800+400+400+x
We move all terms to the left:
x*2-(800+400+400+x)=0
We add all the numbers together, and all the variables
x*2-(x+1600)=0
Wy multiply elements
2x-(x+1600)=0
We get rid of parentheses
2x-x-1600=0
We add all the numbers together, and all the variables
x-1600=0
We move all terms containing x to the left, all other terms to the right
x=1600
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