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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(8*x)/x-7 = 6*x+14/x-7 // - 6*x+14/x-7
(8*x)/x-(6*x)-(14/x)-7+7 = 0
(8*x)/x-6*x-14*x^-1-7+7 = 0
8*x^0-6*x^1-14*x^-1 = 0
(8*x^1-6*x^2-14*x^0)/(x^1) = 0 // * x^2
x^1*(8*x^1-6*x^2-14*x^0) = 0
x^1
8*x-6*x^2-14 = 0
8*x-6*x^2-14 = 0
DELTA = 8^2-(-14*(-6)*4)
DELTA = -272
DELTA < 0
x in { }
x belongs to the empty set
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