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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
220 = x^(1/15-1) // - x^(1/15-1)
220-x^(1/15-1) = 0
-1*x^(-14/15) = -220 // : -1
x^(-14/15) = 220
-14/15 < 0
1/(x^(14/15)) = 220 // * x^(14/15)
1 = 220*x^(14/15) // : 220
1/220 = x^(14/15)
x^(14/15) = 1/220 // ^ 15
x^14 = 1/136880068015412051968000000000000000 // ^ 1/14
abs(x) = (1/136880068015412051968000000000000000)^(1/14)
x = (1/136880068015412051968000000000000000)^(1/14) or x = -(1/136880068015412051968000000000000000)^(1/14)
x in { (1/136880068015412051968000000000000000)^(1/14), -(1/136880068015412051968000000000000000)^(1/14) }
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