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D( y )
1-(2*y) = 0
1-(2*y) = 0
1-(2*y) = 0
1-2*y = 0
1-2*y = 0 // - 1
-2*y = -1 // : -2
y = -1/(-2)
y = 1/2
y in (-oo:1/2) U (1/2:+oo)
(3-(6*y))/(1-(2*y)) = 0
(3-6*y)/(1-2*y) = 0
3-6*y = 0 // - 3
-6*y = -3 // : -6
y = -3/(-6)
y = 1/2
y in { 1/2}
y belongs to the empty set
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