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b in (-oo:+oo)
b-(4/6) = b/3 // - b/3
b-(b/3)-(4/6) = 0
b-(b/3)-2/3 = 0
2/3*b-2/3 = 0 // + 2/3
2/3*b = 2/3 // : 2/3
b = 2/3/2/3
b = 1
b = 1
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