0.4=x-(x*0.9)

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Solution for 0.4=x-(x*0.9) equation: 



0.4=x-(x*0.9)

We move all terms to the left:

0.4-(x-(x*0.9))=0

We add all the numbers together, and all the variables

-(x-(+x*0.9))+0.4=0



We calculate terms in parentheses: -(x-(+x*0.9)), so:

x-(+x*0.9)

We get rid of parentheses

x-x*0.9

Wy multiply elements

x-0.9x

We add all the numbers together, and all the variables

0.1x

Back to the equation:

-(0.1x)



We add all the numbers together, and all the variables

-(+0.1x)+0.4=0

We get rid of parentheses

-0.1x+0.4=0

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

-0.1x=-0.4

x=-0.4/-0.1

x=+4

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