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D( x )
x+6 = 0
x+6 = 0
x+6 = 0
x+6 = 0 // - 6
x = -6
x in (-oo:-6) U (-6:+oo)
0 = (x-5)/(x+6) // - (x-5)/(x+6)
0-((x-5)/(x+6)) = 0
-((x-5)/(x+6)) = 0
(-1*(x-5))/(x+6) = 0
x-5 = 0 // + 5
x = 5
x = 5
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