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D( x )
x+10 = 0
x+10 = 0
x+10 = 0
x+10 = 0 // - 10
x = -10
x in (-oo:-10) U (-10:+oo)
(-2*x-2)/(x+10) = 0
-2*x-2 = 0 // + 2
-2*x = 2 // : -2
x = 2/(-2)
x = -1
x = -1
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