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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
10/x-(10/x)-5 = 4/x // - 4/x
10/x-(10/x)-(4/x)-5 = 0
10/x-10*x^-1-4*x^-1-5 = 0
-4*x^-1 = 5 // : -4
x^-1 = -5/4
-1 < 0
1/(x^1) = -5/4 // * x^1
1 = -5/4*x^1 // : -5/4
-4/5 = x^1
x = -4/5
x = -4/5
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