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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)
(6*x+1)/(x+1) = 0
6*x+1 = 0 // - 1
6*x = -1 // : 6
x = -1/6
x = -1/6
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