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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
7/23 = 14/y // - 14/y
7/23-(14/y) = 0
7/23-14*y^-1 = 0
-14*y^-1 = -7/23 // : -14
y^-1 = 1/46
-1 < 0
1/(y^1) = 1/46 // * y^1
1 = 1/46*y^1 // : 1/46
46 = y^1
y = 46
y = 46
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