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D( j )
4-(5*j) = 0
4-(5*j) = 0
4-(5*j) = 0
4-5*j = 0
4-5*j = 0 // - 4
-5*j = -4 // : -5
j = -4/(-5)
j = 4/5
j in (-oo:4/5) U (4/5:+oo)
(7-(2*j))/(4-(5*j)) = 0
(7-2*j)/(4-5*j) = 0
7-2*j = 0 // - 7
-2*j = -7 // : -2
j = -7/(-2)
j = 7/2
j = 7/2
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