0.1=2x/(0.81-x)*(0.81-x)

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Solution for 0.1=2x/(0.81-x)*(0.81-x) equation: 


D( x )

0.81-x = 0

0.81-x = 0

0.81-x = 0

0.81-x = 0 // - 0.81

-x = -0.81 // * -1

x = 0.81

x in (-oo:0.81) U (0.81:+oo)

0.1 = ((2*x)/(0.81-x))*(0.81-x) // - ((2*x)/(0.81-x))*(0.81-x)

0.1-(((2*x)/(0.81-x))*(0.81-x)) = 0

0.1-2*x = 0

0.1-2*x = 0 // - 0.1

-2*x = -0.1 // : -2

x = -0.1/(-2)

x = 0.05

x = 0.05

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