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b in (-oo:+oo)
6*b+6 = 28/3 // - 28/3
6*b-(28/3)+6 = 0
6*b-28/3+6 = 0
6*b-10/3 = 0 // + 10/3
6*b = 10/3 // : 6
b = 10/3/6
b = 5/9
b = 5/9
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