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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
7*x-((6/6)*x)+7 = x-(2/x)+1 // - x-(2/x)+1
7*x-((6/6)*x)-x+2/x-1+7 = 0
7*x-x-x+2/x-1+7 = 0
5*x^1+2*x^-1+6*x^0 = 0
(5*x^2+6*x^1+2*x^0)/(x^1) = 0 // * x^2
x^1*(5*x^2+6*x^1+2*x^0) = 0
x^1
5*x^2+6*x+2 = 0
5*x^2+6*x+2 = 0
DELTA = 6^2-(2*4*5)
DELTA = -4
DELTA < 0
x in { }
x belongs to the empty set
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