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b in (-oo:+oo)
6*b-(2*b)-4 = 12 // - 12
6*b-(2*b)-12-4 = 0
6*b-2*b-12-4 = 0
4*b-16 = 0 // + 16
4*b = 16 // : 4
b = 16/4
b = 4
b = 4
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