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b in (-oo:+oo)
-(4*b)-8 = 6*b-108 // - 6*b-108
108-(4*b)-(6*b)-8 = 0
108-4*b-6*b-8 = 0
100-10*b = 0 // - 100
-10*b = -100 // : -10
b = -100/(-10)
b = 10
b = 10
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