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D( x )
x < 0
x < 0
x in <0:+oo)
x^(3/4) = 12 // - 12
x^(3/4)-12 = 0
1*x^(3/4) = 12 // : 1
x^(3/4) = 12
x^(3/4) = 12 // ^ 4
x^3 = 20736 // ^ 1/3
x = 12*12^(1/3)
x = 12*12^(1/3)
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