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D( b )
2*b-4 = 0
2*b-4 = 0
2*b-4 = 0
2*b-4 = 0 // + 4
2*b = 4 // : 2
b = 4/2
b = 2
b in (-oo:2) U (2:+oo)
(12*b-16)/(2*b-4) = 0
12*b-16 = 0 // + 16
12*b = 16 // : 12
b = 16/12
b = 4/3
b = 4/3
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