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D( x )
x < 0
x < 0
x in <0:+oo)
9*x^(9/8)-45 = 0
9*x^(9/8) = 45 // : 9
x^(9/8) = 5
x^(9/8) = 5 // ^ 8
x^9 = 390625 // ^ 1/9
x = 390625^(1/9)
x = 390625^(1/9)
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