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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/(x+5) = 5/4 // - 5/4
x/(x+5)-(5/4) = 0
x/(x+5)-5/4 = 0
(4*x)/(4*(x+5))+(-5*(x+5))/(4*(x+5)) = 0
4*x-5*(x+5) = 0
-x-25 = 0
(-x-25)/(4*(x+5)) = 0
(-x-25)/(4*(x+5)) = 0 // * 4*(x+5)
-x-25 = 0
-x-25 = 0 // + 25
-x = 25 // * -1
x = -25
x = -25
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