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D( x )
x^3*((14*x^5)/21) = 0
x^3*((14*x^5)/21) = 0
x^3*((14*x^5)/21) = 0
2/3*x^8 = 0 // : 2/3
x^8 = 0
x = 0
x in (-oo:0) U (0:+oo)
(x^3*((14*x^5)/21))^0 = 0
1 = 0
(x^3*((14*x^5)/21))^0 = 0
1 = 0
x belongs to the empty set
x belongs to the empty set
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