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b in (-oo:+oo)
4-6*b = 2*b+12 // - 2*b+12
4-6*b-(2*b)-12 = 0
4-6*b-2*b-12 = 0
-8*b-8 = 0 // + 8
-8*b = 8 // : -8
b = 8/(-8)
b = -1
b = -1
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