(9/x-1)/2=0.8

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Solution for (9/x-1)/2=0.8 equation: 


D( x )

x = 0

x = 0

x = 0

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

(9/x-1)/2 = 0.8 // - 0.8

(9/x-1)/2-0.8 = 0

(9*x^-1-1)/2-0.8 = 0

(9*x^-1-1)/2+(-0.8*2)/2 = 0

9*x^-1-0.8*2-1 = 0

9*x^-1-2.6 = 0

(9*x^-1-2.6)/2 = 0

(9*x^-1-2.6)/2 = 0 // * 2

9*x^-1-2.6 = 0

9*x^-1 = 2.6 // : 9

x^-1 = 0.28888889

-1 < 0

1/(x^1) = 0.28888889 // * x^1

1 = 0.28888889*x^1 // : 0.28888889

3.46153845 = x^1

x = 3.46153845

x = 3.46153845

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