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D( y )
6-y = 0
6-y = 0
6-y = 0
6-y = 0 // - 6
-y = -6 // * -1
y = 6
y in (-oo:6) U (6:+oo)
8/(6-y) = -2 // + 2
8/(6-y)+2 = 0
8/(6-y)+(2*(6-y))/(6-y) = 0
2*(6-y)+8 = 0
20-2*y = 0
(20-2*y)/(6-y) = 0
(20-2*y)/(6-y) = 0 // * 6-y
20-2*y = 0
20-2*y = 0 // - 20
-2*y = -20 // : -2
y = -20/(-2)
y = 10
y = 10
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