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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4/x-4 = 10/x-1 // - 10/x-1
4/x-(10/x)-4+1 = 0
4/x-10*x^-1-4+1 = 0
-6*x^-1 = 3 // : -6
x^-1 = -1/2
-1 < 0
1/(x^1) = -1/2 // * x^1
1 = -1/2*x^1 // : -1/2
-2 = x^1
x = -2
x = -2
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