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D( x )
7*x^(2/7) = 0
7*x^(3/7) = 0
7*x^(2/7) = 0
7*x^(2/7) = 0
7*x^(2/7) = 0 // : 7
x^(2/7) = 0
x = 0
7*x^(3/7) = 0
7*x^(3/7) = 0
7*x^(3/7) = 0 // : 7
x^(3/7) = 0
x = 0
x in (-oo:0) U (0:+oo)
20/(7*x^(3/7))-(5/(7*x^(2/7))) = 0
(-5/7)*x^(-(2/7))+20/(7*x^(3/7)) = 0
20/7*x^(-3/7)-5/7*x^(-2/7) = 0
5/7*x^(-2/7)*(4*x^(-1/7)-1) = 0
4*x^(-1/7) = 1 // : 4
x^(-1/7) = 1/4
-1/7 < 0
1/(x^(1/7)) = 1/4 // * x^(1/7)
1 = 1/4*x^(1/7) // : 1/4
4 = x^(1/7)
x^(1/7) = 4 // ^ 7
x = 16384
5/(7*x^(2/7)) = 0
5/7*x^(-2/7) = 0 // : 5/7
x^(-2/7) = 0
x należy do O
x = 16384
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