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b in (-oo:+oo)
(2/3)*b-8/9 = 58/9 // - 58/9
(2/3)*b-8/9-(58/9) = 0
(2/3)*b-8/9-58/9 = 0
2/3*b-22/3 = 0 // + 22/3
2/3*b = 22/3 // : 2/3
b = 22/3/2/3
b = 11
b = 11
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