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b in (-oo:+oo)
141 = 6*b+5*b+9 // - 6*b+5*b+9
141-(6*b)-(5*b)-9 = 0
141-6*b-5*b-9 = 0
132-11*b = 0 // - 132
-11*b = -132 // : -11
b = -132/(-11)
b = 12
b = 12
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