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D( x )
x+4 = 0
x = 0
x+4 = 0
x+4 = 0
x+4 = 0 // - 4
x = -4
x = 0
x = 0
x in (-oo:-4) U (-4:0) U (0:+oo)
-22/(x+4) = -11/x // + -11/x
-22/(x+4)-(-11/x) = 0
11*x^-1-22/(x+4) = 0
11/x-22/(x+4) = 0
(-22*x)/(x*(x+4))+(11*(x+4))/(x*(x+4)) = 0
11*(x+4)-22*x = 0
44-11*x = 0
(44-11*x)/(x*(x+4)) = 0
(44-11*x)/(x*(x+4)) = 0 // * x*(x+4)
44-11*x = 0
44-11*x = 0 // - 44
-11*x = -44 // : -11
x = -44/(-11)
x = 4
x = 4
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