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