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