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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
8/y = 14 // - 14
8/y-14 = 0
8*y^-1 = 14 // : 8
y^-1 = 7/4
-1 < 0
1/(y^1) = 7/4 // * y^1
1 = 7/4*y^1 // : 7/4
4/7 = y^1
y = 4/7
y = 4/7
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