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D( x )
x < 0
x < 0
x in <0:+oo)
128 = x^(7/6) // - x^(7/6)
128-x^(7/6) = 0
-1*x^(7/6) = -128 // : -1
x^(7/6) = 128
x^(7/6) = 128 // ^ 6
x^7 = 4398046511104 // ^ 1/7
x = 64
x = 64
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