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D( x )
x = 0
63/x < 0
x = 0
x = 0
63/x < 0
63/x < 0
63*x^-1 < 0
63*x^-1 < 0 // : 63
x^-1 < 0/63
x^-1 < 0
1/(x^1) < 0
x <> 0
1/(x^1) < 0 // * x^2
(x^2)/(x^1) < 0
x^1 < 0
x < 0
x in (-oo:0)
x in (0:+oo)
1-(63/x)^0.3 = 0
-1*x^-0.3 = -1 // : -1
x^-0.3 = 1
-0.3 < 0
1/(x^0.3) = 1 // * x^0.3
1 = 1*x^0.3 // : 1
1 = x^0.3
x^0 = 1^(1/0.3) // ^ 1/0
abs(x) = 1
x = 1 or x = -1
x in { -1}
x = 1
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