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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(8/7)*x+7/x-1 = 0
8/7*x^1+7*x^-1-1*x^0 = 0
(8/7*x^2-1*x^1+7*x^0)/(x^1) = 0 // * x^2
x^1*(8/7*x^2-1*x^1+7*x^0) = 0
x^1
(8/7)*x^2-x+7 = 0
(8/7)*x^2-x+7 = 0
DELTA = (-1)^2-(4*7*(8/7))
DELTA = -31
DELTA < 0
x in { }
x belongs to the empty set
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