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b in (-oo:+oo)
6*b-(4*b)+8 = -12 // + 12
6*b-(4*b)+8+12 = 0
6*b-4*b+8+12 = 0
2*b+20 = 0 // - 20
2*b = -20 // : 2
b = -20/2
b = -10
b = -10
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