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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4/5+1/6 = 1/x // - 1/x
4/5-(1/x)+1/6 = 0
4/5-x^-1+1/6 = 0
-1*x^-1 = -29/30 // : -1
x^-1 = 29/30
-1 < 0
1/(x^1) = 29/30 // * x^1
1 = 29/30*x^1 // : 29/30
30/29 = x^1
x = 30/29
x = 30/29
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