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b in (-oo:+oo)
7*b-(5*b)-(8/9) = 82/9 // - 82/9
7*b-(5*b)-(8/9)-(82/9) = 0
7*b-5*b-8/9-82/9 = 0
2*b-10 = 0 // + 10
2*b = 10 // : 2
b = 10/2
b = 5
b = 5
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