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D( y )
y-8 = 0
y-8 = 0
y-8 = 0
y-8 = 0 // + 8
y = 8
y in (-oo:8) U (8:+oo)
(y^3-512)/(y-8) = 0
1*y^3 = 512 // : 1
y^3 = 512
y^3 = 512 // ^ 1/3
y = 8
y in { 8}
y belongs to the empty set
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