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