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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) = 10 // - 10
x/(x+5)-10 = 0
x/(x+5)+(-10*(x+5))/(x+5) = 0
x-10*(x+5) = 0
-9*x-50 = 0
(-9*x-50)/(x+5) = 0
(-9*x-50)/(x+5) = 0 // * x+5
-9*x-50 = 0
-9*x-50 = 0 // + 50
-9*x = 50 // : -9
x = 50/(-9)
x = -50/9
x = -50/9
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