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b in (-oo:+oo)
b/25 = 8/10 // - 8/10
b/25-(8/10) = 0
b/25-4/5 = 0
1/25*b-4/5 = 0 // + 4/5
1/25*b = 4/5 // : 1/25
b = 4/5/1/25
b = 20
b = 20
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