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