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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)
y = (x-5)/(x+5) // - (x-5)/(x+5)
y-((x-5)/(x+5)) = 0
(-1*(x-5))/(x+5)+y = 0
(-1*(x-5))/(x+5)+(y*(x+5))/(x+5) = 0
y*(x+5)-1*(x-5) = 0
x*y-x+5*y+5 = 0
(x*y-x+5*y+5)/(x+5) = 0
(x*y-x+5*y+5)/(x+5) = 0 // * x+5
x*y-x+5*y+5 = 0
x*y+5*y+5 = 0 // - 5*y+5
x*y = -(5*y+5) // : y
x = (-(5*y+5))/y
x = -(y^-1*(5*y+5))
x = -(y^-1*(5*y+5))
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