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b in (-oo:+oo)
3*b-5/7 = 58/7 // - 58/7
3*b-5/7-(58/7) = 0
3*b-5/7-58/7 = 0
3*b-9 = 0 // + 9
3*b = 9 // : 3
b = 9/3
b = 3
b = 3
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