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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x+x+3/x+6/5 = 3 // - 3
x+x+3/x+6/5-3 = 0
2*x^1+3*x^-1-9/5*x^0 = 0
(2*x^2-9/5*x^1+3*x^0)/(x^1) = 0 // * x^2
x^1*(2*x^2-9/5*x^1+3*x^0) = 0
x^1
2*x^2+(-9/5)*x+3 = 0
2*x^2+(-9/5)*x+3 = 0
DELTA = (-9/5)^2-(2*3*4)
DELTA = -519/25
DELTA < 0
x in { }
x belongs to the empty set
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