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D( x )
x+2 = 0
(x+1)*(X+2) = 0
x+2 = 0
x+2 = 0
x+2 = 0 // - 2
x = -2
(x+1)*(X+2) = 0
(x+1)*(X+2) = 0
x+1 = 0 // - 1
x = -1
x in (-oo:-2) U (-2:-1) U (-1:+oo)
-1/((x+1)*(X+2)) = 1/(x+2)+3 // - 1/(x+2)+3
-1/((x+1)*(X+2))-(1/(x+2))-3 = 0
-1/((x+1)*(X+2))-(x+2)^-1-3 = 0
-1/((x+1)*(X+2))-1/(x+2)-3 = 0
(-1*(x+2))/((x+1)*(X+2)*(x+2))+(-1*(x+1)*(X+2))/((x+1)*(X+2)*(x+2))+(-3*(x+1)*(X+2)*(x+2))/((x+1)*(X+2)*(x+2)) = 0
-1*(x+2)-1*(x+1)*(X+2)-3*(x+1)*(X+2)*(x+2) = 0
-(X*x)-X-3*X*x^2-9*X*x-6*X-6*x^2-3*x-18*x-12-4 = 0
-3*X*x^2-10*X*x-7*X-6*x^2-21*x-16 = 0
(-3*X*x^2-10*X*x-7*X-6*x^2-21*x-16)/((x+1)*(X+2)*(x+2)) = 0
(-3*X*x^2-10*X*x-7*X-6*x^2-21*x-16)/((x+1)*(X+2)*(x+2)) = 0 // * (x+1)*(X+2)*(x+2)
-3*X*x^2-10*X*x-7*X-6*x^2-21*x-16 = 0
-7*X-6*x^2-21*x-16 = 0
DELTA = (-21)^2-(-6*4*(-7*X-16))
DELTA = 24*(-7*X-16)+441
24*(-7*X-16)+441 = 0
24*(-7*X-16)+441 = 0
57-168*X = 0
57-168*X = 0
57-168*X = 0 // - 57
-168*X = -57 // : -168
X = -57/(-168)
X = 19/56
DELTA = 0 <=> t_3 = 19/56
x = 21/(-6*2) i X = 19/56
x = -7/4 i X = 19/56
( x = ((24*(-7*X-16)+441)^(1/2)+21)/(-6*2) or x = (21-(24*(-7*X-16)+441)^(1/2))/(-6*2) ) i X > 19/56
( x = ((24*(-7*X-16)+441)^(1/2)+21)/(-12) or x = (21-(24*(-7*X-16)+441)^(1/2))/(-12) ) i X > 19/56
X-19/56 > 0
X-19/56 > 0 // + 19/56
X > 19/56
x in { -7/4, ((24*(-7*X-16)+441)^(1/2)+21)/(-12), (21-(24*(-7*X-16)+441)^(1/2))/(-12) }
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