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b in (-oo:+oo)
2*b-(6*b)+8 = 16 // - 16
2*b-(6*b)-16+8 = 0
2*b-6*b-16+8 = 0
-4*b-8 = 0 // + 8
-4*b = 8 // : -4
b = 8/(-4)
b = -2
b = -2
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