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b in (-oo:+oo)
(2/3)*b = 8/7 // - 8/7
(2/3)*b-(8/7) = 0
(2/3)*b-8/7 = 0
2/3*b-8/7 = 0 // + 8/7
2/3*b = 8/7 // : 2/3
b = 8/7/2/3
b = 12/7
b = 12/7
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