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k in (-oo:+oo)
2*k^(2/5) = 0.25*k // - 0.25*k
2*k^(2/5)-(0.25*k) = 0
2*k^(2/5)-0.25*k = 0
2*k^(2/5)-0.25*k = 0
k^(2/5)*(2-0.25*k^(3/5)) = 0
-0.25*k^(3/5) = -2 // : -0.25
k^(3/5) = 8
( 8 < 0 i 3/5 in (0:1) ) => k należy do O
k^(2/5) = 0
1*k^(2/5) = 0 // : 1
k^(2/5) = 0
k = 0
k = 0
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