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b in (-oo:+oo)
b/45 = 8/9 // - 8/9
b/45-(8/9) = 0
b/45-8/9 = 0
1/45*b-8/9 = 0 // + 8/9
1/45*b = 8/9 // : 1/45
b = 8/9/1/45
b = 40
b = 40
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