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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
-4/x = 43 // - 43
-4/x-43 = 0
-4*x^-1 = 43 // : -4
x^-1 = -43/4
-1 < 0
1/(x^1) = -43/4 // * x^1
1 = -43/4*x^1 // : -43/4
-4/43 = x^1
x = -4/43
x = -4/43
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