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