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D( x )
x^4 = 0
x^4 = 0
x^4 = 0
1*x^4 = 0 // : 1
x^4 = 0
x = 0
x in (-oo:0) U (0:+oo)
(6*x^3-7)/(x^4) = 0
6*x^3 = 7 // : 6
x^3 = 7/6
x^3 = 7/6 // ^ 1/3
x = (7/6)^(1/3)
x = (7/6)^(1/3)
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