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D( b )
2*b+2 = 0
2*b+2 = 0
2*b+2 = 0
2*b+2 = 0 // - 2
2*b = -2 // : 2
b = -2/2
b = -1
b in (-oo:-1) U (-1:+oo)
16/(2*b+2) = 0
b belongs to the empty set
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