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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
5/y = 13/8 // - 13/8
5/y-(13/8) = 0
5/y-13/8 = 0
5*y^-1 = 13/8 // : 5
y^-1 = 13/40
-1 < 0
1/(y^1) = 13/40 // * y^1
1 = 13/40*y^1 // : 13/40
40/13 = y^1
y = 40/13
y = 40/13
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