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D( x )
x < 0
x < 0
x in <0:+oo)
X^(7/2)-(4*x^(5/4)) = 0
X^(7/2)-4*x^(5/4) = 0
-4*x^(5/4) = -X^(7/2) // : -4
x^(5/4) = (X^(7/2))/4
x^(5/4) = (X^(7/2))/4 // ^ 4
x^5 = (X^14)/256 // ^ 1/5
x = (X^(14/5))/(2*8^(1/5))
x = (X^(14/5))/(2*8^(1/5))
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