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D( j )
3-j = 0
3-j = 0
3-j = 0
3-j = 0 // - 3
-j = -3 // * -1
j = 3
j in (-oo:3) U (3:+oo)
(6*j+12)/(3-j) = 0
6*j+12 = 0 // - 12
6*j = -12 // : 6
j = -12/6
j = -2
j = -2
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