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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
15-((1/2)/b) = -3 // + 3
3-((1/2)/b)+15 = 0
(-1/2)*b^-1+3+15 = 0
-1/2*b^-1 = -18 // : -1/2
b^-1 = 36
-1 < 0
1/(b^1) = 36 // * b^1
1 = 36*b^1 // : 36
1/36 = b^1
b = 1/36
b = 1/36
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