0.4=(12-x)/x

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Solution for 0.4=(12-x)/x equation: 



0.4=(12-x)/x

We move all terms to the left:

0.4-((12-x)/x)=0



Domain of the equation: x)!=0

x!=0/1

x!=0

x∈R



We add all the numbers together, and all the variables

-((-1x+12)/x)+0.4=0

We multiply all the terms by the denominator


-((-1x+12)+(0.4)*x)=0



We calculate terms in parentheses: -((-1x+12)+(0.4)*x), so:

(-1x+12)+(0.4)*x

We multiply parentheses

(-1x+12)+0.4x

We get rid of parentheses

-1x+0.4x+12

We add all the numbers together, and all the variables

-0.6x+12

Back to the equation:

-(-0.6x+12)



We get rid of parentheses

0.6x-12=0

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

0.6x=12

x=12/0.6

x=20

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