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D( y )
y^2 = 0
y^2 = 0
y^2 = 0
1*y^2 = 0 // : 1
y^2 = 0
y = 0
y in (-oo:0) U (0:+oo)
y-((9/5)*y)-((3/(y^2))*y^2) = 0
y+(-9/5)*y-3 = 0
-4/5*y-3 = 0 // + 3
-4/5*y = 3 // : -4/5
y = 3/(-4/5)
y = -15/4
y = -15/4
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