2x-(18/x)=0

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Solution for 2x-(18/x)=0 equation: 


D( x )

x = 0

x = 0

x = 0

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

2*x-(18/x) = 0

2*x-18*x^-1 = 0

2*x^1-18*x^-1 = 0

(2*x^2-18*x^0)/(x^1) = 0 // * x^2

x^1*(2*x^2-18*x^0) = 0

x^1

2*x^2-18 = 0

2*x^2-18 = 0

DELTA = 0^2-(-18*2*4)

DELTA = 144

DELTA > 0

x = (144^(1/2)+0)/(2*2) or x = (0-144^(1/2))/(2*2)

x = 3 or x = -3

x in { -3, 3} 

x in { -3, 3 }

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