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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
315/b = 75/100 // - 75/100
315/b-(75/100) = 0
315/b-3/4 = 0
315*b^-1 = 3/4 // : 315
b^-1 = 1/420
-1 < 0
1/(b^1) = 1/420 // * b^1
1 = 1/420*b^1 // : 1/420
420 = b^1
b = 420
b = 420
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