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b in (-oo:+oo)
(1/8)*(10*b-2) = (5/4)*b-(1/2) // - (5/4)*b-(1/2)
(1/8)*(10*b-2)-((5/4)*b)+1/2 = 0
(1/8)*(10*b-2)+(-5/4)*b+1/2 = 0
1/8*(10*b-2)+(-5*b)/4+1/2 = 0
(1/8*2*4*(10*b-2))/(2*4)+(-5*2*b)/(2*4)+(1*4)/(2*4) = 0
1/8*2*4*(10*b-2)-5*2*b+1*4 = 0
4-2 = 0
2 = 0
2/(2*4) = 0
2/(2*4) = 0 // * 2*4
2 = 0
b belongs to the empty set
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