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x=400+0.5x
We move all terms to the left:
x-(400+0.5x)=0
We add all the numbers together, and all the variables
x-(0.5x+400)=0
We get rid of parentheses
x-0.5x-400=0
We add all the numbers together, and all the variables
0.5x-400=0
We move all terms containing x to the left, all other terms to the right
0.5x=400
x=400/0.5
x=800
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