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D( j )
6*j-8 = 0
6*j-8 = 0
6*j-8 = 0
6*j-8 = 0 // + 8
6*j = 8 // : 6
j = 8/6
j = 4/3
j in (-oo:4/3) U (4/3:+oo)
(-3*j)/(6*j-8) = 0
-3*j = 0 // : -3
j = 0
j = 0
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