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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
250/b = 76/15.2 // - 76/15.2
250/b-(76/15.2) = 0
250/b-5 = 0
250*b^-1 = 5 // : 250
b^-1 = 1/50
-1 < 0
1/(b^1) = 1/50 // * b^1
1 = 1/50*b^1 // : 1/50
50 = b^1
b = 50
b = 50
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