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D( y )
3*y = 0
3*y = 0
3*y = 0
3*y = 0 // : 3
y = 0
y in (-oo:0) U (0:+oo)
(4*y-8)/(3*y) = 6 // - 6
(4*y-8)/(3*y)-6 = 0
(4*y-8)/(3*y)+(-6*3*y)/(3*y) = 0
4*y-6*3*y-8 = 0
-14*y-8 = 0
(-14*y-8)/(3*y) = 0
(-14*y-8)/(3*y) = 0 // * 3*y
-14*y-8 = 0
-14*y-8 = 0 // + 8
-14*y = 8 // : -14
y = 8/(-14)
y = -4/7
y = -4/7
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