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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
242/b = 44 // - 44
242/b-44 = 0
242*b^-1 = 44 // : 242
b^-1 = 2/11
-1 < 0
1/(b^1) = 2/11 // * b^1
1 = 2/11*b^1 // : 2/11
11/2 = b^1
b = 11/2
b = 11/2
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