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D( x )
7*x^(4/7) = 0
7*x^(4/7) = 0
7*x^(4/7) = 0
7*x^(4/7) = 0 // : 7
x^(4/7) = 0
x = 0
x in (-oo:0) U (0:+oo)
3/(7*x^(4/7)) = 0
3/7*x^(-4/7) = 0 // : 3/7
x^(-4/7) = 0
x należy do O
x belongs to the empty set
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