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b in (-oo:+oo)
b+9 = 6*b+14 // - 6*b+14
b-(6*b)-14+9 = 0
b-6*b-14+9 = 0
-5*b-5 = 0 // + 5
-5*b = 5 // : -5
b = 5/(-5)
b = -1
b = -1
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