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D( j )
(3*j+1)^2 = 0
(3*j+1)^2 = 0
(3*j+1)^2 = 0
3*j+1 = 0 // - 1
3*j = -1 // : 3
j = -1/3
j in (-oo:-1/3) U (-1/3:+oo)
((j+3)^5)/((3*j+1)^2) = 0
j+3 = 0 // - 3
j = -3
j in { -3, -3, -3, -3, -3 }
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