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b in (-oo:+oo)
9*b-(2/3) = 7/9 // - 7/9
9*b-(2/3)-(7/9) = 0
9*b-2/3-7/9 = 0
9*b-13/9 = 0 // + 13/9
9*b = 13/9 // : 9
b = 13/9/9
b = 13/81
b = 13/81
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