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b in (-oo:+oo)
6*b = 12/7 // - 12/7
6*b-(12/7) = 0
6*b-12/7 = 0
6*b-12/7 = 0 // + 12/7
6*b = 12/7 // : 6
b = 12/7/6
b = 2/7
b = 2/7
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