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D( y )
y+3 = 0
y+3 = 0
y+3 = 0
y+3 = 0 // - 3
y = -3
y in (-oo:-3) U (-3:+oo)
2/(y+3)-(-6/(y+3))-2 = 0
2/(y+3)+6*(y+3)^-1-2 = 0
2/(y+3)+6/(y+3)-2 = 0
2/(y+3)+6/(y+3)+(-2*(y+3))/(y+3) = 0
2-2*(y+3)+6 = 0
8-2*y-6 = 0
2-2*y = 0
(2-2*y)/(y+3) = 0
(2-2*y)/(y+3) = 0 // * y+3
2-2*y = 0
2-2*y = 0 // - 2
-2*y = -2 // : -2
y = -2/(-2)
y = 1
y = 1
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