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b in (-oo:+oo)
12 = 6*b-4*b-6 // - 6*b-4*b-6
6-(-4*b)-(6*b)+12 = 0
4*b-6*b+6+12 = 0
18-2*b = 0 // - 18
-2*b = -18 // : -2
b = -18/(-2)
b = 9
b = 9
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