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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
4/y-(3/8)-(3/8) = 0
4/y-3/8-3/8 = 0
4*y^-1 = 3/4 // : 4
y^-1 = 3/16
-1 < 0
1/(y^1) = 3/16 // * y^1
1 = 3/16*y^1 // : 3/16
16/3 = y^1
y = 16/3
y = 16/3
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