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