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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
X/x+3 = 4 // - 4
X/x-4+3 = 0
X*x^-1 = 1 // : X
x^-1 = 1/X
-1 < 0
1/(x^1) = 1/X // * x^1
1 = (1/X)*x^1 // : 1/X
X = x^1
x = X
x = X
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