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b in (-oo:+oo)
-53 = 6*b-b+7 // - 6*b-b+7
b-(6*b)-53-7 = 0
b-6*b-53-7 = 0
-5*b-60 = 0 // + 60
-5*b = 60 // : -5
b = 60/(-5)
b = -12
b = -12
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