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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
13/y = 7/8 // - 7/8
13/y-(7/8) = 0
13/y-7/8 = 0
13*y^-1 = 7/8 // : 13
y^-1 = 7/104
-1 < 0
1/(y^1) = 7/104 // * y^1
1 = 7/104*y^1 // : 7/104
104/7 = y^1
y = 104/7
y = 104/7
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