20/x=0.8x

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Solution for 20/x=0.8x equation: 


D( x )

x = 0

x = 0

x = 0

x in (-oo:0) U (0:+oo)

20/x = 0.8*x // - 0.8*x

20/x-(0.8*x) = 0

20/x-0.8*x = 0

20*x^-1-0.8*x = 0

x^-1*(20-0.8*x^2) = 0

-0.8*x^2 = -20 // : -0.8

x^2 = 25

x^2 = 25 // ^ 1/2

abs(x) = 5

x = 5 or x = -5

1/x = 0

1*x^-1 = 0 // : 1

x^-1 = 0

x należy do O

x in { 5, -5 }

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