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b in (-oo:+oo)
b/13-(3*b) = 8/13 // - 8/13
b/13-(3*b)-(8/13) = 0
b/13-3*b-8/13 = 0
-38/13*b-8/13 = 0 // + 8/13
-38/13*b = 8/13 // : -38/13
b = 8/13/(-38/13)
b = -4/19
b = -4/19
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