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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
5/y = -3/5 // + -3/5
5/y-(-3/5) = 0
5/y+3/5 = 0
5*y^-1 = -3/5 // : 5
y^-1 = -3/25
-1 < 0
1/(y^1) = -3/25 // * y^1
1 = -3/25*y^1 // : -3/25
-25/3 = y^1
y = -25/3
y = -25/3
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