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b in (-oo:+oo)
b^2+b/2+b+b-3+5 = 47 // - 47
b^2+b/2+b+b-47-3+5 = 0
b^2+5/2*b-45 = 0
DELTA = (5/2)^2-(-45*1*4)
DELTA = 745/4
DELTA > 0
b = ((745/4)^(1/2)-5/2)/(1*2) or b = (-(745/4)^(1/2)-5/2)/(1*2)
b = ((745/4)^(1/2)-5/2)/2 or b = (-((745/4)^(1/2)+5/2))/2
b in { (-((745/4)^(1/2)+5/2))/2, ((745/4)^(1/2)-5/2)/2 }
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