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