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D( j )
3-(3*j) = 0
3-(3*j) = 0
3-(3*j) = 0
3-3*j = 0
3-3*j = 0 // - 3
-3*j = -3 // : -3
j = -3/(-3)
j = 1
j in (-oo:1) U (1:+oo)
15/(3-(3*j)) = 0
15/(3-3*j) = 0
j belongs to the empty set
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