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b in (-oo:+oo)
-3*b = 30/11 // - 30/11
-3*b-(30/11) = 0
-3*b-30/11 = 0
-3*b-30/11 = 0 // + 30/11
-3*b = 30/11 // : -3
b = 30/11/(-3)
b = -10/11
b = -10/11
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