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D( j )
7-(2*j) = 0
7-(2*j) = 0
7-(2*j) = 0
7-2*j = 0
7-2*j = 0 // - 7
-2*j = -7 // : -2
j = -7/(-2)
j = 7/2
j in (-oo:7/2) U (7/2:+oo)
1/(7-(2*j)) = 0
1/(7-2*j) = 0
j belongs to the empty set
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