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D( y )
3*y = 0
3*y = 0
3*y = 0
3*y = 0 // : 3
y = 0
y in (-oo:0) U (0:+oo)
(27*y^3+18)/(3*y) = 0
27*y^3 = -18 // : 27
y^3 = -2/3
y^3 = -2/3 // ^ 1/3
y = -(2/3)^(1/3)
y = -(2/3)^(1/3)
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