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D( x )
x+4 = 0
x-4 = 0
x+4 = 0
x+4 = 0
x+4 = 0 // - 4
x = -4
x-4 = 0
x-4 = 0
x-4 = 0 // + 4
x = 4
x in (-oo:-4) U (-4:4) U (4:+oo)
(((6*x)/(x+4))*(x-4))/(x-4) = 0
(6*x)/(x+4) = 0
6*x = 0 // : 6
x = 0
x = 0
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