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b in (-oo:+oo)
4*(b+5/3) = 4*b-(12/6) // - 4*b-(12/6)
4*(b+5/3)-(4*b)+12/6 = 0
4*(b+5/3)-4*b+12/6 = 0
4*(b+5/3)-4*b+2 = 0
4*(b+5/3)-4*b+2 = 0
2+20/3 = 0
26/3 = 0
26/3 = 0
26/3 = 0 // * 3
26 = 0
b belongs to the empty set
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