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b in (-oo:+oo)
b+b/2-(4/6) = 0
b+b/2-2/3 = 0
3/2*b-2/3 = 0 // + 2/3
3/2*b = 2/3 // : 3/2
b = 2/3/3/2
b = 4/9
b = 4/9
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