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b in (-oo:+oo)
5*b-(4/10) = 4/5 // - 4/5
5*b-(4/10)-(4/5) = 0
5*b-2/5-4/5 = 0
5*b-6/5 = 0 // + 6/5
5*b = 6/5 // : 5
b = 6/5/5
b = 6/25
b = 6/25
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