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x in (-oo:+oo)
B/13-((3*b)/13) = (8*b)/13 // - (8*b)/13
B/13-((3*b)/13)-((8*b)/13) = 0
B/13+(-3/13)*b+(-8/13)*b = 0
1/13*B-11/13*b = 0
x naleu017Cy do R
x in (-oo:+oo)
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