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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
2-((5/2)*b) = (2*b)/b+1 // - (2*b)/b+1
2-((5/2)*b)-((2*b)/b)-1 = 0
(-5/2)*b-2-1+2 = 0
-5/2*b-1 = 0 // + 1
-5/2*b = 1 // : -5/2
b = 1/(-5/2)
b = -2/5
b = -2/5
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