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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
5/y = 14/4 // - 14/4
5/y-(14/4) = 0
5/y-7/2 = 0
5*y^-1 = 7/2 // : 5
y^-1 = 7/10
-1 < 0
1/(y^1) = 7/10 // * y^1
1 = 7/10*y^1 // : 7/10
10/7 = y^1
y = 10/7
y = 10/7
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