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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)
4-(3*y)-((y^2)/(y^2))-10 = 0
4-3*y-10-1 = 0
-3*y-7 = 0 // + 7
-3*y = 7 // : -3
y = 7/(-3)
y = -7/3
y = -7/3
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