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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
160/b = 0.2 // - 0.2
160/b-0.2 = 0
160*b^-1 = 0.2 // : 160
b^-1 = 0.00125
-1 < 0
1/(b^1) = 0.00125 // * b^1
1 = 0.00125*b^1 // : 0.00125
800 = b^1
b = 800
b = 800
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