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b in (-oo:+oo)
3*b-(2/6) = b-(4/18) // - b-(4/18)
3*b-b-(2/6)+4/18 = 0
3*b-b-1/3+4/18 = 0
2*b-1/9 = 0 // + 1/9
2*b = 1/9 // : 2
b = 1/9/2
b = 1/18
b = 1/18
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