400=x+0.4x

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Solution for 400=x+0.4x equation: 



400=x+0.4x

We move all terms to the left:

400-(x+0.4x)=0

We add all the numbers together, and all the variables

-(+1.4x)+400=0

We get rid of parentheses

-1.4x+400=0

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

-1.4x=-400

x=-400/-1.4

x=285+1/1.4

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