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B/13-((3*b)/13) = 8/23 // - 8/23
B/13-((3*b)/13)-(8/23) = 0
B/13+(-3/13)*b-8/23 = 0
1/13*B-3/13*b-8/23 = 0
x naleu017Cy do R
x in (-oo:+oo)
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