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