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D( m )
7-(2*m) = 0
7-(2*m) = 0
7-(2*m) = 0
7-2*m = 0
7-2*m = 0 // - 7
-2*m = -7 // : -2
m = -7/(-2)
m = 7/2
m in (-oo:7/2) U (7/2:+oo)
(4*m-14)/(7-(2*m)) = 0
(4*m-14)/(7-2*m) = 0
4*m-14 = 0 // + 14
4*m = 14 // : 4
m = 14/4
m = 7/2
m in { 7/2}
m belongs to the empty set
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