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D( x )
4-x <= 0
4-x <= 0
4-x <= 0
4-x <= 0
-x <= -4 // * -1
x >= 4
x in (-oo:4)
ln(4-x) = 1/3 // - 1/3
ln(4-x)-(1/3) = 0
ln(4-x)-1/3 = 0
ln(4-x)-1/3 = 0 // + 1/3
ln(4-x) = 1/3
ln(4-x) = ln(e^(1/3))
4-x = e^(1/3)
4-x-e^(1/3) = 0 // - 4-e^(1/3)
-x = -(4-e^(1/3)) // * -1
x = 4-e^(1/3)
x = 4-e^(1/3)
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