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D( x )
x < 0
x < 0
x in <0:+oo)
2*x^(9/8)-14 = 0
2*x^(9/8) = 14 // : 2
x^(9/8) = 7
x^(9/8) = 7 // ^ 8
x^9 = 5764801 // ^ 1/9
x = 5764801^(1/9)
x = 5764801^(1/9)
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