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b in (-oo:+oo)
7*b+8 = 86/9 // - 86/9
7*b-(86/9)+8 = 0
7*b-86/9+8 = 0
7*b-14/9 = 0 // + 14/9
7*b = 14/9 // : 7
b = 14/9/7
b = 2/9
b = 2/9
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