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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
22/y = 11/7 // - 11/7
22/y-(11/7) = 0
22/y-11/7 = 0
22*y^-1 = 11/7 // : 22
y^-1 = 1/14
-1 < 0
1/(y^1) = 1/14 // * y^1
1 = 1/14*y^1 // : 1/14
14 = y^1
y = 14
y = 14
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