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D( x )
x^5 = 0
x^5 = 0
x^5 = 0
1*x^5 = 0 // : 1
x^5 = 0
x = 0
x in (-oo:0) U (0:+oo)
12/(x^5) = 18 // - 18
12/(x^5)-18 = 0
12*x^-5 = 18 // : 12
x^-5 = 3/2
-5 < 0
1/(x^5) = 3/2 // * x^5
1 = 3/2*x^5 // : 3/2
2/3 = x^5
x^5 = 2/3 // ^ 1/5
x = (2/3)^(1/5)
x = (2/3)^(1/5)
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