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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
(2.6-y)/y = 1/3 // - 1/3
(2.6-y)/y-(1/3) = 0
(2.6-y)/y-1/3 = 0
(3*(2.6-y))/(3*y)+(-1*y)/(3*y) = 0
3*(2.6-y)-1*y = 0
7.8-4*y = 0
(7.8-4*y)/(3*y) = 0
(7.8-4*y)/(3*y) = 0 // * 3*y
7.8-4*y = 0
7.8-4*y = 0 // - 7.8
-4*y = -7.8 // : -4
y = -7.8/(-4)
y = 1.95
y = 1.95
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