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