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D( y )
y-6 = 0
y-6 = 0
y-6 = 0
y-6 = 0 // + 6
y = 6
y in (-oo:6) U (6:+oo)
6*y*((6-y)/(y-6)) = 0
(6*y*(6-y))/(y-6) = 0
( 6*y )
6*y = 0 // : 6
y = 0
( 6-y )
6-y = 0 // - 6
-y = -6 // * -1
y = 6
y in { 6}
y = 0
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