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b in (-oo:+oo)
-10 = 6*b-5*b-9 // - 6*b-5*b-9
9-(-5*b)-(6*b)-10 = 0
5*b-6*b-10+9 = 0
-b-1 = 0 // + 1
-b = 1 // * -1
b = -1
b = -1
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