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D( X )
X^2+8*X+12 = 0
X^2+15*X+54 = 0
X^2+8*X+12 = 0
X^2+8*X+12 = 0
X^2+8*X+12 = 0
DELTA = 8^2-(1*4*12)
DELTA = 16
DELTA > 0
X = (16^(1/2)-8)/(1*2) or X = (-16^(1/2)-8)/(1*2)
X = -2 or X = -6
X^2+15*X+54 = 0
X^2+15*X+54 = 0
X^2+15*X+54 = 0
DELTA = 15^2-(1*4*54)
DELTA = 9
DELTA > 0
X = (9^(1/2)-15)/(1*2) or X = (-9^(1/2)-15)/(1*2)
X = -6 or X = -9
X in (-oo:-9) U (-9:-6) U (-6:-2) U (-2:+oo)
(2*X)/(X^2+15*X+54)-(5/(X^2+8*X+12)) = 0
(2*X)/(X^2+15*X+54)-5*(X^2+8*X+12)^-1 = 0
(2*X)/(X^2+15*X+54)-5/(X^2+8*X+12) = 0
X^2+15*X+54 = 0
X^2+15*X+54 = 0
X^2+15*X+54 = 0
DELTA = 15^2-(1*4*54)
DELTA = 9
DELTA > 0
X = (9^(1/2)-15)/(1*2) or X = (-9^(1/2)-15)/(1*2)
X = -6 or X = -9
(X+9)*(X+6) = 0
X^2+8*X+12 = 0
X^2+8*X+12 = 0
X^2+8*X+12 = 0
DELTA = 8^2-(1*4*12)
DELTA = 16
DELTA > 0
X = (16^(1/2)-8)/(1*2) or X = (-16^(1/2)-8)/(1*2)
X = -2 or X = -6
(X+6)*(X+2) = 0
(2*X)/((X+9)*(X+6))-5/((X+6)*(X+2)) = 0
(2*X)/((X+9)*(X+6))+(-5*(X+9))/((X+9)*(X+6)) = 0
2*X-5*(X+9) = 0
-3*X-45 = 0
(-3*X-45)/((X+9)*(X+6)) = 0
(-3*X-45)/((X+9)*(X+6)) = 0 // * (X+9)*(X+6)
-3*X-45 = 0
-3*X-45 = 0 // + 45
-3*X = 45 // : -3
X = 45/(-3)
X = -15
X = -15
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