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b in (-oo:+oo)
3*b = 12/5 // - 12/5
3*b-(12/5) = 0
3*b-12/5 = 0
3*b-12/5 = 0 // + 12/5
3*b = 12/5 // : 3
b = 12/5/3
b = 4/5
b = 4/5
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