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x=0.8x+200
We move all terms to the left:
x-(0.8x+200)=0
We get rid of parentheses
x-0.8x-200=0
We add all the numbers together, and all the variables
0.2x-200=0
We move all terms containing x to the left, all other terms to the right
0.2x=200
x=200/0.2
x=1000
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