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b in (-oo:+oo)
2*b-(6/7) = 582/7-(5*b) // - 582/7-(5*b)
2*b+5*b-(6/7)-(582/7) = 0
2*b+5*b-6/7-582/7 = 0
7*b-84 = 0 // + 84
7*b = 84 // : 7
b = 84/7
b = 12
b = 12
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