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D( x )
x < 0
x < 0
x in <0:+oo)
x^(3/4) = 221 // - 221
x^(3/4)-221 = 0
1*x^(3/4) = 221 // : 1
x^(3/4) = 221
x^(3/4) = 221 // ^ 4
x^3 = 2385443281 // ^ 1/3
x = 221*221^(1/3)
x = 221*221^(1/3)
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