4=-0.4(8/x)

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Solution for 4=-0.4(8/x) equation: 



4=-0.4(8/x)

We move all terms to the left:

4-(-0.4(8/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

-(-0.4(+8/x))+4=0

We multiply all the terms by the denominator


-(-0.4(+8+4*x))=0



We calculate terms in parentheses: -(-0.4(+8+4*x)), so:

-0.4(+8+4*x)

We add all the numbers together, and all the variables

-0.4(4x+8)

We multiply parentheses

-1.6x-3.2

Back to the equation:

-(-1.6x-3.2)



We get rid of parentheses

1.6x+3.2=0

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

1.6x=-3.2

x=-3.2/1.6

x=-2

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