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b in (-oo:+oo)
(3/7)*b = 27/77 // - 27/77
(3/7)*b-(27/77) = 0
(3/7)*b-27/77 = 0
3/7*b-27/77 = 0 // + 27/77
3/7*b = 27/77 // : 3/7
b = 27/77/3/7
b = 9/11
b = 9/11
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