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