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D( j )
7-(6*j) = 0
7-(6*j) = 0
7-(6*j) = 0
7-6*j = 0
7-6*j = 0 // - 7
-6*j = -7 // : -6
j = -7/(-6)
j = 7/6
j in (-oo:7/6) U (7/6:+oo)
(6*j)/(7-(6*j)) = 0
(6*j)/(7-6*j) = 0
6*j = 0 // : 6
j = 0
j = 0
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