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D( x )
x = 0
x-4 = 0
x = 0
x = 0
x-4 = 0
x-4 = 0
x-4 = 0 // + 4
x = 4
x in (-oo:0) U (0:4) U (4:+oo)
-14/x = -22/(x-4) // + -22/(x-4)
-(-22/(x-4))-14/x = 0
22*(x-4)^-1-14/x = 0
22/(x-4)-14/x = 0
(22*x)/(x*(x-4))+(-14*(x-4))/(x*(x-4)) = 0
22*x-14*(x-4) = 0
8*x+56 = 0
(8*x+56)/(x*(x-4)) = 0
(8*x+56)/(x*(x-4)) = 0 // * x*(x-4)
8*x+56 = 0
8*x+56 = 0 // - 56
8*x = -56 // : 8
x = -56/8
x = -7
x = -7
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