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D( x )
x < 0
x < 0
x in <0:+oo)
x^(1/2) = 27 // - 27
x^(1/2)-27 = 0
1*x^(1/2) = 27 // : 1
x^(1/2) = 27
x^(1/2) = 27 // ^ 2
x = 729
x = 729
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