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b in (-oo:+oo)
-(5*b)-(6*b)-7 = 4 // - 4
-(5*b)-(6*b)-7-4 = 0
-5*b-6*b-7-4 = 0
-11*b-11 = 0 // + 11
-11*b = 11 // : -11
b = 11/(-11)
b = -1
b = -1
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