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D( X )
X = 0
X < 0
X = 0
X = 0
X < 0
X in (0:+oo)
X^(-3/4) = 0.8 // - 0.8
X^(-3/4)-0.8 = 0
1*X^(-3/4) = 0.8 // : 1
X^(-3/4) = 0.8
-3/4 < 0
1/(X^(3/4)) = 0.8 // * X^(3/4)
1 = 0.8*X^(3/4) // : 0.8
1.25 = X^(3/4)
X^(3/4) = 1.25 // ^ 4
X^3 = 1.25^4 // ^ 1/3
X = 1.25^(4/3)
X = 1.25^(4/3)
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