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D( y )
y+3 = 0
y+6 = 0
y-2 = 0
y+3 = 0
y+3 = 0
y+3 = 0 // - 3
y = -3
y+6 = 0
y+6 = 0
y+6 = 0 // - 6
y = -6
y-2 = 0
y-2 = 0
y-2 = 0 // + 2
y = 2
y in (-oo:-6) U (-6:-3) U (-3:2) U (2:+oo)
5/(y+3)+3/(y-2) = 8/(y+6) // - 8/(y+6)
5/(y+3)+3/(y-2)-(8/(y+6)) = 0
5/(y+3)+3/(y-2)-8*(y+6)^-1 = 0
5/(y+3)+3/(y-2)-8/(y+6) = 0
(5*(y-2)*(y+6))/((y+3)*(y-2)*(y+6))+(3*(y+3)*(y+6))/((y+3)*(y-2)*(y+6))+(-8*(y+3)*(y-2))/((y+3)*(y-2)*(y+6)) = 0
5*(y-2)*(y+6)+3*(y+3)*(y+6)-8*(y+3)*(y-2) = 0
8*y^2-8*y^2+47*y-8*y-6+48 = 0
39*y+42 = 0
(39*y+42)/((y+3)*(y-2)*(y+6)) = 0
(39*y+42)/((y+3)*(y-2)*(y+6)) = 0 // * (y+3)*(y-2)*(y+6)
39*y+42 = 0
39*y+42 = 0 // - 42
39*y = -42 // : 39
y = -42/39
y = -14/13
y = -14/13
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