9=x-0.3x-0.4x

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Solution for 9=x-0.3x-0.4x equation: 



9=x-0.3x-0.4x

We move all terms to the left:

9-(x-0.3x-0.4x)=0

We add all the numbers together, and all the variables

-(+0.3x)+9=0

We get rid of parentheses

-0.3x+9=0

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

-0.3x=-9

x=-9/-0.3

x=+30

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