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b in (-oo:+oo)
-(6*b)-7 = -31 // + 31
31-(6*b)-7 = 0
31-6*b-7 = 0
24-6*b = 0 // - 24
-6*b = -24 // : -6
b = -24/(-6)
b = 4
b = 4
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