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b in (-oo:+oo)
b/13-(9*b) = 40/13 // - 40/13
b/13-(9*b)-(40/13) = 0
b/13-9*b-40/13 = 0
-116/13*b-40/13 = 0 // + 40/13
-116/13*b = 40/13 // : -116/13
b = 40/13/(-116/13)
b = -10/29
b = -10/29
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