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D( x )
x+5 = 0
(x+5)^2 = 0
x+5 = 0
x+5 = 0
x+5 = 0 // - 5
x = -5
(x+5)^2 = 0
(x+5)^2 = 0
x+5 = 0 // - 5
x = -5
x in (-oo:-5) U (-5:+oo)
6/(x+5)-5 = 1/((x+5)^2) // - 1/((x+5)^2)
6/(x+5)-(1/((x+5)^2))-5 = 0
6/(x+5)-(x+5)^-2-5 = 0
6/(x+5)-1/((x+5)^2)-5 = 0
(6*(x+5))/((x+5)^2)-1/((x+5)^2)+(-5*(x+5)^2)/((x+5)^2) = 0
6*(x+5)-5*(x+5)^2-1 = 0
6*x-5*x^2-50*x-125+29 = 0
-5*x^2-44*x-96 = 0
-5*x^2-44*x-96 = 0
-1*(5*x^2+44*x+96) = 0
5*x^2+44*x+96 = 0
DELTA = 44^2-(4*5*96)
DELTA = 16
DELTA > 0
x = (16^(1/2)-44)/(2*5) or x = (-16^(1/2)-44)/(2*5)
x = -4 or x = -24/5
-1*(x+24/5)*(x+4) = 0
(-1*(x+24/5)*(x+4))/((x+5)^2) = 0
(-1*(x+24/5)*(x+4))/((x+5)^2) = 0 // * (x+5)^2
-1*(x+24/5)*(x+4) = 0
( x+24/5 )
x+24/5 = 0 // - 24/5
x = -24/5
( x+4 )
x+4 = 0 // - 4
x = -4
x in { -24/5, -4 }
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