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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2*x+6/x = 7/2 // - 7/2
2*x+6/x-(7/2) = 0
2*x+6/x-7/2 = 0
2*x^1+6*x^-1-7/2*x^0 = 0
(2*x^2-7/2*x^1+6*x^0)/(x^1) = 0 // * x^2
x^1*(2*x^2-7/2*x^1+6*x^0) = 0
x^1
2*x^2+(-7/2)*x+6 = 0
2*x^2+(-7/2)*x+6 = 0
DELTA = (-7/2)^2-(2*4*6)
DELTA = -143/4
DELTA < 0
x in { }
x belongs to the empty set
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