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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
4/y = 11/7 // - 11/7
4/y-(11/7) = 0
4/y-11/7 = 0
4*y^-1 = 11/7 // : 4
y^-1 = 11/28
-1 < 0
1/(y^1) = 11/28 // * y^1
1 = 11/28*y^1 // : 11/28
28/11 = y^1
y = 28/11
y = 28/11
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