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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
3/5 = 10/y+4 // - 10/y+4
3/5-(10/y)-4 = 0
3/5-10*y^-1-4 = 0
-10*y^-1 = 17/5 // : -10
y^-1 = -17/50
-1 < 0
1/(y^1) = -17/50 // * y^1
1 = -17/50*y^1 // : -17/50
-50/17 = y^1
y = -50/17
y = -50/17
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