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b in (-oo:+oo)
b/13-((3*b)/13) = 13 // - 13
b/13-((3*b)/13)-13 = 0
b/13+(-3/13)*b-13 = 0
-2/13*b-13 = 0 // + 13
-2/13*b = 13 // : -2/13
b = 13/(-2/13)
b = -169/2
b = -169/2
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