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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/x+6/x-4+5 = 0
11*x^-1 = -1 // : 11
x^-1 = -1/11
-1 < 0
1/(x^1) = -1/11 // * x^1
1 = -1/11*x^1 // : -1/11
-11 = x^1
x = -11
x = -11
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