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b in (-oo:+oo)
6*b-2 = 4*b-8 // - 4*b-8
6*b-(4*b)-2+8 = 0
6*b-4*b-2+8 = 0
2*b+6 = 0 // - 6
2*b = -6 // : 2
b = -6/2
b = -3
b = -3
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