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b in (-oo:+oo)
b/19-(6*b)-19 = 45/19 // - 45/19
b/19-(6*b)-(45/19)-19 = 0
b/19-6*b-45/19-19 = 0
-113/19*b-406/19 = 0 // + 406/19
-113/19*b = 406/19 // : -113/19
b = 406/19/(-113/19)
b = -406/113
b = -406/113
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