4.0=x-3.9

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Solution for 4.0=x-3.9 equation: 



4.0=x-3.9

We move all terms to the left:

4.0-(x-3.9)=0

We add all the numbers together, and all the variables

-(x-3.9)+4=0

We get rid of parentheses

-x+3.9+4=0

We add all the numbers together, and all the variables

-1x+7.9=0

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

-x=-7.9

x=-7.9/-1

x=7+0.9/1

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