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b in (-oo:+oo)
-1 = ((5/8)*b^3)/8 // - ((5/8)*b^3)/8
-(((5/8)*b^3)/8)-1 = 0
(-5/64)*b^3-1 = 0
-5/64*b^3 = 1 // : -5/64
b^3 = -64/5
b^3 = -64/5 // ^ 1/3
b = -(64/5)^(1/3)
b = -(64/5)^(1/3)
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