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b in (-oo:+oo)
52 = 2*b+6*b-4 // - 2*b+6*b-4
4-(2*b)-(6*b)+52 = 0
4-2*b-6*b+52 = 0
56-8*b = 0 // - 56
-8*b = -56 // : -8
b = -56/(-8)
b = 7
b = 7
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