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