400=x-(.2)x

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Solution for 400=x-(.2)x equation: 



400=x-(.2)x

We move all terms to the left:

400-(x-(.2)x)=0

We add all the numbers together, and all the variables

-(x-(0.2)x)+400=0



We calculate terms in parentheses: -(x-(0.2)x), so:

x-(0.2)x

We multiply parentheses

x-0.2x

We add all the numbers together, and all the variables

0.8x

Back to the equation:

-(0.8x)



We add all the numbers together, and all the variables

-(+0.8x)+400=0

We get rid of parentheses

-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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