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b in (-oo:+oo)
5*b+8/9 = 413/9 // - 413/9
5*b+8/9-(413/9) = 0
5*b+8/9-413/9 = 0
5*b-45 = 0 // + 45
5*b = 45 // : 5
b = 45/5
b = 9
b = 9
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