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b in (-oo:+oo)
5/3 = 2*b-3*b+2/3 // - 2*b-3*b+2/3
5/3-(-3*b)-(2*b)-(2/3) = 0
3*b-2*b+5/3-2/3 = 0
b+1 = 0 // - 1
b = -1
b = -1
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