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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
6/y = 13/8 // - 13/8
6/y-(13/8) = 0
6/y-13/8 = 0
6*y^-1 = 13/8 // : 6
y^-1 = 13/48
-1 < 0
1/(y^1) = 13/48 // * y^1
1 = 13/48*y^1 // : 13/48
48/13 = y^1
y = 48/13
y = 48/13
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