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D( x )
x < 0
x < 0
x in <0:+oo)
x^(7/4) = 7/4 // - 7/4
x^(7/4)-(7/4) = 0
x^(7/4)-7/4 = 0
1*x^(7/4) = 7/4 // : 1
x^(7/4) = 7/4
x^(7/4) = 7/4 // ^ 4
x^7 = 2401/256 // ^ 1/7
x = (2401/256)^(1/7)
x = (2401/256)^(1/7)
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