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D( y )
y = 0
y^2 = 0
y = 0
y = 0
y^2 = 0
y^2 = 0
1*y^2 = 0 // : 1
y^2 = 0
y = 0
y in (-oo:0) U (0:+oo)
(5*y^2)/(y^2)-16 = 10/y+(6*y)/y-4+4 // - 10/y+(6*y)/y-4+4
(5*y^2)/(y^2)-(10/y)-((6*y)/y)-16-4+4 = 0
(5*y^2)/(y^2)-10*y^-1-16-6-4+4 = 0
-10*y^-1 = 17 // : -10
y^-1 = -17/10
-1 < 0
1/(y^1) = -17/10 // * y^1
1 = -17/10*y^1 // : -17/10
-10/17 = y^1
y = -10/17
y = -10/17
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