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D( x )
x+5 = 0
x^2+10*x+25 = 0
x+5 = 0
x+5 = 0
x+5 = 0 // - 5
x = -5
x^2+10*x+25 = 0
x^2+10*x+25 = 0
x^2+10*x+25 = 0
DELTA = 10^2-(1*4*25)
DELTA = 0
x = -10/(1*2)
x = -5 or x = -5
x in (-oo:-5) U (-5:+oo)
4/(x+5)-((6*x-1)/(x^2+10*x+25)) = 0
4/(x+5)+(-1*(6*x-1))/(x^2+10*x+25) = 0
x^2+10*x+25 = 0
x^2+10*x+25 = 0
x^2+10*x+25 = 0
DELTA = 10^2-(1*4*25)
DELTA = 0
x = -10/(1*2)
x = -5 or x = -5
(x+5)^2 = 0
4/(x+5)+(-1*(6*x-1))/((x+5)^2) = 0
(4*(x+5))/((x+5)^2)+(-1*(6*x-1))/((x+5)^2) = 0
4*(x+5)-1*(6*x-1) = 0
21-2*x = 0
(21-2*x)/((x+5)^2) = 0
(21-2*x)/((x+5)^2) = 0 // * (x+5)^2
21-2*x = 0
21-2*x = 0 // - 21
-2*x = -21 // : -2
x = -21/(-2)
x = 21/2
x = 21/2
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