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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
-8 = 4/x // - 4/x
-(4/x)-8 = 0
-4*x^-1-8 = 0
-4*x^-1 = 8 // : -4
x^-1 = -2
-1 < 0
1/(x^1) = -2 // * x^1
1 = -2*x^1 // : -2
-1/2 = x^1
x = -1/2
x = -1/2
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