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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
-(4/24) = 5/x // - 5/x
-(5/x)-(4/24) = 0
-5*x^-1-1/6 = 0
-5*x^-1 = 1/6 // : -5
x^-1 = -1/30
-1 < 0
1/(x^1) = -1/30 // * x^1
1 = -1/30*x^1 // : -1/30
-30 = x^1
x = -30
x = -30
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