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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
6/20 = 54/b // - 54/b
6/20-(54/b) = 0
6/20-54*b^-1 = 0
-54*b^-1 = -3/10 // : -54
b^-1 = 1/180
-1 < 0
1/(b^1) = 1/180 // * b^1
1 = 1/180*b^1 // : 1/180
180 = b^1
b = 180
b = 180
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