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D( x )
2*x+2 = 0
2*x+2 = 0
2*x+2 = 0
2*x+2 = 0 // - 2
2*x = -2 // : 2
x = -2/2
x = -1
x in (-oo:-1) U (-1:+oo)
17/(2*x+2) = 0
x belongs to the empty set
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