x-0.20x=400

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Solution for x-0.20x=400 equation: 



x-0.20x=400

We move all terms to the left:

x-0.20x-(400)=0

We add all the numbers together, and all the variables

0.8x-400=0

We move all terms containing x to the left, all other terms to the right

0.8x=400

x=400/0.8

x=500

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