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D( b )
3*b-4 = 0
3*b-4 = 0
3*b-4 = 0
3*b-4 = 0 // + 4
3*b = 4 // : 3
b = 4/3
b in (-oo:4/3) U (4/3:+oo)
8/(3*b-4)+3*4*b+2*41*b-(15*b)-(3*28) = 0
8/(3*b-4)+3*4*b+2*41*b-15*b-84 = 0
8/(3*b-4)+12*b+82*b-15*b-84 = 0
8/(3*b-4)+(12*b*(3*b-4))/(3*b-4)+(82*b*(3*b-4))/(3*b-4)+(-15*b*(3*b-4))/(3*b-4)+(-84*(3*b-4))/(3*b-4) = 0
12*b*(3*b-4)+82*b*(3*b-4)-15*b*(3*b-4)-84*(3*b-4)+8 = 0
36*b^2+246*b^2-45*b^2-48*b-328*b+60*b-252*b+8+336 = 0
282*b^2-45*b^2-376*b+60*b-252*b+8+336 = 0
237*b^2-316*b-252*b+8+336 = 0
237*b^2-568*b+344 = 0
237*b^2-568*b+344 = 0
237*b^2-568*b+344 = 0
DELTA = (-568)^2-(4*237*344)
DELTA = -3488
DELTA < 0
1 = 0
1/(3*b-4) = 0
1/(3*b-4) = 0 // * 3*b-4
1 = 0
b belongs to the empty set
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