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b in (-oo:+oo)
((12*b)/5)*b^2+3*b^2-((12/6)*b^2)-((10/10)*b^2)+20*b = 0
((12*b)/5)*b^2+3*b^2-2*b^2-b^2+20*b = 0
12/5*b^3+20*b = 0
4*b*(3/5*b^2+5) = 0
3/5*b^2 = -5 // : 3/5
b^2 = -25/3
4*b = 0
4*b = 0 // : 4
b = 0
b = 0
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