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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
7/y = 11/17 // - 11/17
7/y-(11/17) = 0
7/y-11/17 = 0
7*y^-1 = 11/17 // : 7
y^-1 = 11/119
-1 < 0
1/(y^1) = 11/119 // * y^1
1 = 11/119*y^1 // : 11/119
119/11 = y^1
y = 119/11
y = 119/11
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