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b in (-oo:+oo)
-45 = 6*b+5*b-1 // - 6*b+5*b-1
1-(6*b)-(5*b)-45 = 0
1-6*b-5*b-45 = 0
-11*b-44 = 0 // + 44
-11*b = 44 // : -11
b = 44/(-11)
b = -4
b = -4
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