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b in (-oo:+oo)
6*b = 12/5 // - 12/5
6*b-(12/5) = 0
6*b-12/5 = 0
6*b-12/5 = 0 // + 12/5
6*b = 12/5 // : 6
b = 12/5/6
b = 2/5
b = 2/5
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