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D( x )
4*x^3-12 = 0
4*x^3-12 = 0
4*x^3-12 = 0
4*x^3 = 12 // : 4
x^3 = 3
x^3 = 3 // ^ 1/3
x = 3^(1/3)
x in (-oo:3^(1/3)) U (3^(1/3):+oo)
36-(24/(4*x^3-12)) = 0
36-24*(4*x^3-12)^-1 = 0
36-24/(4*x^3-12) = 0
(36*(4*x^3-12))/(4*x^3-12)-24/(4*x^3-12) = 0
36*(4*x^3-12)-24 = 0
144*x^3-456 = 0
(144*x^3-456)/(4*x^3-12) = 0
(144*x^3-456)/(4*x^3-12) = 0 // * 4*x^3-12
144*x^3-456 = 0
144*x^3 = 456 // : 144
x^3 = 19/6
x^3 = 19/6 // ^ 1/3
x = (19/6)^(1/3)
x = (19/6)^(1/3)
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