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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
(3*y-8)/y = 2.4 // - 2.4
(3*y-8)/y-2.4 = 0
(3*y-8)/y+(-2.4*y)/y = 0
3*y-2.4*y-8 = 0
0.6*y-8 = 0
(0.6*y-8)/y = 0
(0.6*y-8)/y = 0 // * y
0.6*y-8 = 0
0.6*y-8 = 0 // + 8
0.6*y = 8 // : 0.6
y = 8/0.6
y = 13.33333333
y = 13.33333333
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