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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3*x-(2*x)+7/x+7/x-1-1 = 0
3*x-2*x+7/x+7/x-1-1 = 0
1*x^1+14*x^-1-2*x^0 = 0
(1*x^2-2*x^1+14*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^2-2*x^1+14*x^0) = 0
x^1
x^2-2*x+14 = 0
x^2-2*x+14 = 0
DELTA = (-2)^2-(1*4*14)
DELTA = -52
DELTA < 0
x in { }
x belongs to the empty set
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