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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
-225/b = 15 // - 15
-225/b-15 = 0
-225*b^-1 = 15 // : -225
b^-1 = -1/15
-1 < 0
1/(b^1) = -1/15 // * b^1
1 = -1/15*b^1 // : -1/15
-15 = b^1
b = -15
b = -15
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