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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2*x+5/x-3 = 6/7 // - 6/7
2*x+5/x-(6/7)-3 = 0
2*x+5/x-6/7-3 = 0
2*x^1+5*x^-1-27/7*x^0 = 0
(2*x^2-27/7*x^1+5*x^0)/(x^1) = 0 // * x^2
x^1*(2*x^2-27/7*x^1+5*x^0) = 0
x^1
2*x^2+(-27/7)*x+5 = 0
2*x^2+(-27/7)*x+5 = 0
DELTA = (-27/7)^2-(2*4*5)
DELTA = -1231/49
DELTA < 0
x in { }
x belongs to the empty set
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