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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
16-((4*b^2)/b)-2 = 0
16-4*b-2 = 0
14-4*b = 0 // - 14
-4*b = -14 // : -4
b = -14/(-4)
b = 7/2
b = 7/2
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