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D( x )
x+5 = 0
x+5 = 0
x+5 = 0
x+5 = 0 // - 5
x = -5
x in (-oo:-5) U (-5:+oo)
(x+2)/(x+5) = 2/5+1/5 // - 2/5+1/5
(x+2)/(x+5)-(2/5)-(1/5) = 0
(x+2)/(x+5)-2/5-1/5 = 0
(5*(x+2))/(5*(x+5))+(-2*(x+5))/(5*(x+5))+(-1*(x+5))/(5*(x+5)) = 0
5*(x+2)-2*(x+5)-1*(x+5) = 0
3*x-x-5 = 0
2*x-5 = 0
(2*x-5)/(5*(x+5)) = 0
(2*x-5)/(5*(x+5)) = 0 // * 5*(x+5)
2*x-5 = 0
2*x-5 = 0 // + 5
2*x = 5 // : 2
x = 5/2
x = 5/2
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