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