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D( Y )
Y = 0
Y = 0
Y = 0
Y in (-oo:0) U (0:+oo)
2/Y-3 = 2/7 // - 2/7
2/Y-(2/7)-3 = 0
2/Y-2/7-3 = 0
2*Y^-1 = 23/7 // : 2
Y^-1 = 23/14
-1 < 0
1/(Y^1) = 23/14 // * Y^1
1 = 23/14*Y^1 // : 23/14
14/23 = Y^1
Y = 14/23
Y = 14/23
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