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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
3.5/6.2 = 7.35/b // - 7.35/b
3.5/6.2-(7.35/b) = 0
3.5/6.2-7.35*b^-1 = 0
-7.35*b^-1 = -0.56451613 // : -7.35
b^-1 = 0.07680492
-1 < 0
1/(b^1) = 0.07680492 // * b^1
1 = 0.07680492*b^1 // : 0.07680492
13.01999924 = b^1
b = 13.01999924
b = 13.01999924
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