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D( y )
3*y+9 = 0
y+3 = 0
2*y+6 = 0
3*y+9 = 0
3*y+9 = 0
3*y+9 = 0 // - 9
3*y = -9 // : 3
y = -9/3
y = -3
y+3 = 0
y+3 = 0
y+3 = 0 // - 3
y = -3
2*y+6 = 0
2*y+6 = 0
2*y+6 = 0 // - 6
2*y = -6 // : 2
y = -6/2
y = -3
y in (-oo:-3) U (-3:+oo)
(4*y)/(2*y+6)+(2*y+3)/(3*y+9) = (5*y+8)/(y+3) // - (5*y+8)/(y+3)
(4*y)/(2*y+6)+(2*y+3)/(3*y+9)-((5*y+8)/(y+3)) = 0
(4*y)/(2*y+6)+(2*y+3)/(3*y+9)+(-1*(5*y+8))/(y+3) = 0
(4*y*(3*y+9)*(y+3))/((2*y+6)*(3*y+9)*(y+3))+((2*y+3)*(2*y+6)*(y+3))/((2*y+6)*(3*y+9)*(y+3))+(-1*(5*y+8)*(2*y+6)*(3*y+9))/((2*y+6)*(3*y+9)*(y+3)) = 0
4*y*(3*y+9)*(y+3)+(2*y+3)*(2*y+6)*(y+3)-1*(5*y+8)*(2*y+6)*(3*y+9) = 0
16*y^3-30*y^3+102*y^2-228*y^2+180*y-558*y-432+54 = 0
-14*y^3-126*y^2-378*y-378 = 0
-14*y^3-126*y^2-378*y-378 = 0
-14*(y^3+9*y^2+27*y+27) = 0
y^3+9*y^2+27*y+27 = 0
{ 1, -1, 3, -3, 9, -9, 27, -27 }
1
y = 1
y^3+9*y^2+27*y+27 = 64
1
-1
y = -1
y^3+9*y^2+27*y+27 = 8
-1
3
y = 3
y^3+9*y^2+27*y+27 = 216
3
-3
y = -3
y^3+9*y^2+27*y+27 = 0
-3
y+3
y^2+6*y+9
y^3+9*y^2+27*y+27
y+3
-y^3-3*y^2
6*y^2+27*y+27
-6*y^2-18*y
9*y+27
-9*y-27
0
y^2+6*y+9 = 0
DELTA = 6^2-(1*4*9)
DELTA = 0
y = -6/(1*2)
y = -3 or y = -3
y in { -3, -3, -3}
-14*(y+3)^3 = 0
(-14*(y+3)^3)/((2*y+6)*(3*y+9)*(y+3)) = 0
(-14*(y+3)^3)/((2*y+6)*(3*y+9)*(y+3)) = 0 // * (2*y+6)*(3*y+9)*(y+3)
-14*(y+3)^3 = 0
y+3 = 0 // - 3
y = -3
y in { -3}
y belongs to the empty set
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