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D( y )
3*y+2 = 0
3*y+2 = 0
3*y+2 = 0
3*y+2 = 0 // - 2
3*y = -2 // : 3
y = -2/3
y in (-oo:-2/3) U (-2/3:+oo)
(9*y^3+2*y)/(3*y+2) = 0
9*y^3+2*y = 0
y*(9*y^2+2) = 0
9*y^2 = -2 // : 9
y^2 = -2/9
y = 0
y/(3*y+2) = 0
y = 0
y = 0
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