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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3*x-(5/x) = 0
3*x-5*x^-1 = 0
3*x^1-5*x^-1 = 0
(3*x^2-5*x^0)/(x^1) = 0 // * x^2
x^1*(3*x^2-5*x^0) = 0
x^1
3*x^2-5 = 0
3*x^2-5 = 0
DELTA = 0^2-(-5*3*4)
DELTA = 60
DELTA > 0
x = (60^(1/2)+0)/(2*3) or x = (0-60^(1/2))/(2*3)
x = (1*15^(1/2))/3 or x = (-15^(1/2))/3
x in { (-15^(1/2))/3, (1*15^(1/2))/3}
x in { (-15^(1/2))/3, (1*15^(1/2))/3 }
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