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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6/x+5 = 4/x-4 // - 4/x-4
6/x-(4/x)+4+5 = 0
6/x-4*x^-1+4+5 = 0
2*x^-1 = -9 // : 2
x^-1 = -9/2
-1 < 0
1/(x^1) = -9/2 // * x^1
1 = -9/2*x^1 // : -9/2
-2/9 = x^1
x = -2/9
x = -2/9
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