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b in (-oo:+oo)
b/13-((7*b)/13) = 24/13 // - 24/13
b/13-((7*b)/13)-(24/13) = 0
b/13+(-7/13)*b-24/13 = 0
-6/13*b-24/13 = 0 // + 24/13
-6/13*b = 24/13 // : -6/13
b = 24/13/(-6/13)
b = -4
b = -4
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